window.onresize监听div和屏幕的改变
监听屏幕的改变：
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no, width=device-width">
<meta content="telephone=no" name="format-detection">
</head>
<body>
<label id="show"></label>
<script>
window.onresize = adjuest;
adjuest();
function adjuest(){
var label = document.getElementById("show");
label.innerHTML = "width = "+window.innerWidth+";height="+window.innerHeight;
}
</script>
</body>
</html>
效果： 
2 .监听div大小的改变
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div id="show_div" style="background-color: lightblue;width: 100%;height: 300px;"></div>
<label id="show"></label>
<script>
window.onresize = adjuest;
adjuest();
function adjuest(){
var label = document.getElementById("show");
var divCon = document.getElementById("show_div");
label.innerHTML = "width = "+divCon.offsetWidth+";height="+divCon.offsetHeight;
}
</script>
</body>
</html>
效果： 
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谢谢，好文章，非常喜欢。