Firefox:Dive Into Greasemonkey/4.4. Doing something for every HTML element

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4.4. 操作所有 HTML 元素

有时您需要对一个页面中所有HTML元素进行相同的操作。Firefox支持 getElementsByTagName('*')，它返回可遍历元素的全集。

示例: 遍历所有元素

var allElements, thisElement;
allElements = document.getElementsByTagName('*');
for (var i = 0; i < allElements.length; i++) {
    thisElement = allElements[i];
    // do something with thisElement
}

只有您真正需要操作所有元素时才能采用这种方法。如果您预知只要操作特定的元素，使用XPath查询可以更快地帮您找到这些元素。更多信息请查看“操作特定 HTML 元素的所有实例”

[编辑]

实例

Anti-Disabler (http://diveintogreasemonkey.org/download/antidisabler.user.js)

← 测试一个页面是否包含 HTML 元素

操作特定 HTML 元素的所有实例 →

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取自"http://wiki.mozcn.org/index.php/Firefox:Dive_Into_Greasemonkey/4.4._Doing_something_for_every_HTML_element"

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