Firefox:Dive Into Greasemonkey/4.16. Post-processing a page after it renders
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您的位置：Dive Into Greasemonkey → 公用模式 → 对已载入的页面做后续处理
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4.16. 对已载入的页面做后续处理
如果要对页面上的 DOM 做出大规模的修改，那么这个操作应该发生在页面完成载入之后，这是由已执行页面在 Firefox 内的存储方式决定的。您可以使用 addEventListener 函数来推迟某个处理过程的执行时间。
例子: 替换页面的全部内容
var newBody =
'<html>' +
'<head>' +
'<title>My New Page</title>' +
'</head>' +
'<body>' +
'<p>This page is a complete replacement of the original.</p>' +
'</body>' +
'</html>';
window.addEventListener(
'load',
function() { document.body.innerHTML = newBody; },
true);
仔细看这段代码，您可能会感到奇怪：它是怎么被执行的？我声明了一个普通的函数 function 来传递 window.addEventListener 的第二个参数，它访问了在这个函数外定义的变量 newBody。这种方法称为"closure”, 在 Javascript 中是合法的。 一般说来， 在“外层“函数中定义的”内层“函数可以访问”外层“函数的所有局部变量---甚至在”外层“函数结束执行之后。这是一个很有用的特性，您可以通过它来创建事件处理函数和其他函数（它们含有在页面运行时才被创建的数据结构）。
 | 删除和替换 document.body.innerHTML 并不会更改页面的任何元素。所有在<head>中定义的内容仍然是有效的，包括页面的标题，CSS 样式，以及脚本。您可以单独修改或者删除它们。 |
[编辑]
实例
- Access Bar (http://diveintogreasemonkey.org/download/accessbar.user.js)
- BetterDir (http://diveintogreasemonkey.org/download/betterdir.user.js)
← 设置元素样式
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