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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>获取图片真实宽高 demo</title>
  <style media="screen">
    img {
      width: 100px;
      height: 50px;
    }
  </style>
</head>
<body>
  <img id="imgg" src="https://www.google.com.hk/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png" alt="">
</body>
</html>
<script>
    //通过offsetWidth、offsetHeigth获取图片高宽，这个不是真实的，是css这是之后的最后样式的高宽
    document.querySelector('img').onload = function(){
      console.log('offsetWidht：' + this.offsetWidth + 'px')
      console.log('offsetHeight：' + this.offsetHeight + 'px')
    }
​
    //通过img对象搭配onload获取原图片真实的高宽
    var img_url ='https://www.google.com.hk/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png'
    // 创建对象
    var img = new Image()
    // 改变图片的src
    img.src = img_url
    // 加载完成执行
    img.onload = function(){
    // 打印
    console.log('图片真实width: '+img.width+', 图片真实height: '+img.height)
    }
  </script>
​
Output

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