DOMContentLoaded与onload加载顺序

最新推荐文章于 2020-09-13 10:53:37 发布

bnmjstu

最新推荐文章于 2020-09-13 10:53:37 发布

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分类专栏： JavaScript 文章标签： function xhtml resources border table class

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本文详细介绍了DOM事件中的load和DOMContentLoaded事件的区别及使用方法。load事件在文档及其所有资源加载完成后触发，而DOMContentLoaded则在DOM构建完成后立即触发，无需等待其他资源加载。

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window.onload = function() {
init();
doSomethingElse();
};

<!doctype html>
<html>
<head>
<title>onload test</title>
<script>
function load() {
alert("load event detected!");
}
window.onload = load;
</script>
</head>
<body>
<p>The load event fires when the document has finished loading!</p>
</body>
</html>

The load event fires at the end of the document loading process. At this point, all of the objects in the document are in the DOM, and all the images and sub-frames have finished loading.

There are also Gecko-Specific DOM Events like DOMContentLoaded and DOMFrameContentLoaded (which can be handled using element.addEventListener() ) which are fired after the DOM for the page has been constructed, but do not wait for other resources to finish loading.

以上引用：https://developer.mozilla.org/en/DOM/window.onload

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>addEventListener增加事件监听</title>
<style type="text/css">
.t{border: 1px solid red;width:100%;border-collapse:collapse;border-sapcing:0px;}
#t1{background-color:pink;}
</style>
<script type="text/javascript">
function modifyText () {
// Function to change the content of t2
var t2 = document.getElementById("t2");
t2.firstChild.nodeValue = "three";
}

function load () {
// Function to add event listener to t
var el = document.getElementById("t");
el.addEventListener("click",modifyText,false);
}
document.addEventListener("DOMContentLoaded",load,false);
</script>
</head>
<body>
<table class="t" id="t">
<tr>
<td id="t1">one</td>
</tr>
<tr>
<td id="t2">two</td>
</tr>
</table>
</body>
</html>