wuheng
/
vip21-javaweb


			
				
					
						
						
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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>