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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <title>Title</title>
- </head>
- <body>
- <img src="beijing.jpg" width="400" >
- <script>
- /**
- * setAttribute 可以修改 元素属性
- * 但是不能修改 style , 除非 把整个 style 全部重新赋值
- * @param arg
- */
- document.querySelector("img").onmouseout = function(arg){
- this.setAttribute("width", 400)
- }
- document.querySelector("img").onmouseover = function(){
- this.setAttribute("width", 1400)
- }
- </script>
- </body>
- </html>
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