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css加载会阻塞.html
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css加载会阻塞.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>css阻塞</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
h1 {
color: red !important
}
</style>
</head>
<body>
<script type="text/javascript">
//console.log(a)
var t= 3
console.log(t)//script放在头部如果报错不会阻塞dom加载
</script>
<h1>这是红色的</h1>
<div class="dropdown">
<!-- Link or button to toggle dropdown -->
<ul class="dropdown-menu" role="menu" aria-labelledby="dLabel">
<li><a tabindex="-1" href="#">Action</a></li>
<li><a tabindex="-1" href="#">Another action</a></li>
<li><a tabindex="-1" href="#">Something else here</a></li>
<li class="divider">Something</li>
<li><a tabindex="-1" href="#">Separated link</a></li>
</ul>
<ul class="dropdown-menu" role="menu" aria-labelledby="dLabel">
...
<li class="dropdown-submenu">
<a tabindex="-1" href="#">More options</a>
<ul class="dropdown-menu">
...
</ul>
</li>
</ul>
</div>
</body>
<script src="jquery/jquery.js"></script>
<script>
function h () {
console.log(document.querySelectorAll('h1'))
}
setTimeout(h, 0)
console.log('是否会阻塞js渲染');
// 阻塞js渲染
// 阻塞页面渲染
// 不阻塞页面解析
// 管理media标签 在link处设置 或者
// $('#fontLink').load(function () {
// $(this).attr('media', 'all');
// //地址，数据解析
// handleUrlData();
// });
//也可以使用js 动态加载
var link = $('<link>');
link.attr('href','https://cdn.bootcss.com/jqueryui/1.12.1/jquery-ui.css');
link.attr('rel','stylesheet');
$('head').append(link);
// link.onload = function () {
//
// }
$.get('https://cdn.bootcss.com/jqueryui/1.12.1/jquery-ui.css','1',function (value) {
console.log('onload')
})
</script>
</html>