lovecoding
/
web0715


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            width: 300px;
            height: 50px;
            background-color: red;
        }
    </style>
</head>
<body>
    <div class="box"></div>
    <script>
        var oBox = document.getElementsByClassName("box")[0];
        var timer1 = null;
        var timer2 = null;
        // 鼠标移入控制元素不断变长
        oBox.onmouseenter = function(){
            clearInterval(timer2);
            timer1 = setInterval(function(){
                oBox.style.width = (oBox.offsetWidth+5)+"px";
                if(oBox.offsetWidth>500){
                    clearInterval(timer1);
                }
            },16)
        }
        // 鼠标移出后控制元素不断变短
        oBox.onmouseleave = function(){
            clearInterval(timer1);
            timer2 = setInterval(function(){
                oBox.style.width = (oBox.offsetWidth-5) + "px";
                if(oBox.offsetWidth<300){
                    clearInterval(timer2)
                }
            },16)
        }
    </script>
</body>
</html>