Firefox:Dive Into Greasemonkey/4.3. Testing whether a page includes an HTML element

Mozilla中文Wiki

您的位置：Dive Into Greasemonkey → 公用模式 → 测试一个页面是否包含 HTML 元素

4.3. 测试一个页面是否包含 HTML 元素

您可以使用 getElementsByTagName 函数来测试一个页面是否包含 HTML 元素。

示例：测试页面是否包含 <textarea> 元素

var textareas = document.getElementsByTagName('textarea');
if (textareas.length) {
    // there is at least one textarea on this page
} else {
    // there are no textareas on this page
}

实例

BetterDir (http://diveintogreasemonkey.org/download/betterdir.user.js)
Zoom Textarea (http://diveintogreasemonkey.org/download/zoomtextarea.user.js)

← 测试一个Greasemonkey函数是否有效

操作所有 HTML 元素 →

Strict Standards: Non-static method Namespace::getUser() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 510

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::isTalk() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1367

Strict Standards: Non-static method Namespace::getTalk() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1387

Strict Standards: Non-static method Namespace::isTalk() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 99

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1437

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1439

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1439

Strict Standards: Non-static method Namespace::getImage() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1505

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getSpecial() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/languages/Language.php on line 1456

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getSpecial() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/languages/Language.php on line 1456

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getUser() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 775

Strict Standards: Non-static method Namespace::getTalk() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 776

Strict Standards: Non-static method Namespace::getUser() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 776

Strict Standards: Non-static method Namespace::isTalk() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 99

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getSpecial() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/languages/Language.php on line 1456

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Title::makeTitle() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 718

Strict Standards: Non-static method Title::makeName() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 138

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Only variables should be assigned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 718

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 900

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getSpecial() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/languages/Language.php on line 1456

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getSpecial() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/languages/Language.php on line 1456

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getUser() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 510

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::isTalk() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1367

Strict Standards: Non-static method Namespace::getTalk() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1387

Strict Standards: Non-static method Namespace::isTalk() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 99

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1437

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1439

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1439

Strict Standards: Non-static method Namespace::getImage() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1505

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getSpecial() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/languages/Language.php on line 1456

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getSpecial() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/languages/Language.php on line 1456

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getUser() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1023

Strict Standards: Non-static method Namespace::getTalk() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1024

Strict Standards: Non-static method Namespace::getUser() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1024

Strict Standards: Non-static method Namespace::isTalk() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 99

Strict Standards: Non-static method Namespace::getSpecial() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/languages/Language.php on line 1456

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

取自"http://wiki.mozcn.org/index.php/Firefox:Dive_Into_Greasemonkey/4.3._Testing_whether_a_page_includes_an_HTML_element"

本页面已经被浏览2578次。最后更改13:57 2005年11月18日. 本站内容在创作共用署名-非商业用途-保持一致条款下发布。