<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>获取元素的真实宽高Demo</title>
<style>
.box {
width: 500px;
height: 600px;
border: 2px solid black;
}
</style>
</head>
<body>
<div class="box">Hello World</div>
</body>
</html>
<script>
// 利用页面元素宽高的`element.offsetHeight`和`element.offsetWidth`方法
var realHeight = document.querySelector('.box').offsetHeight
var realWidth = document.querySelector('.box').offsetWidth
// 使用`window.getComputedStyle().width/height`,但是这个方法经测试,没有包含border的宽度
var Height = window.getComputedStyle(document.querySelector('.box')).height
var Width = window.getComputedStyle(document.querySelector('.box')).width
console.log('realHeight: ' + realHeight + 'px')
console.log('realWidth: ' + realWidth + 'px')
console.log('Height: ' + Height)
console.log('Width: ' + Width)
</script>
Output
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