lovecoding
/
W250913


			
				
					
						
						
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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: 200px;
            height: 50px;
            background-color: red;
        }
    </style>
</head>

<body>
    <div class="box"></div>
    <script>
        var oBox = document.getElementsByClassName("box")[0];
        // 控制递增定时器
        var timer1 = null;
        // 控制递减定时器
        var timer2 = null;
        oBox.onmouseover = function () {
            clearInterval(timer2);
            var _width = oBox.offsetWidth;
            timer1 = setInterval(function () {
                if (_width >= 600) {
                    clearInterval(timer1);
                } else {
                    _width += 10;
                    oBox.style.width = _width + "px";
                }
            }, 16);
        }

        oBox.onmouseout = function(){
            clearInterval(timer1);
            var _width = oBox.offsetWidth;
            timer2 = setInterval(function(){
                if(_width <= 200){
                    clearInterval(timer2);
                }else{
                    _width -= 10;
                    oBox.style.width = _width + "px";
                }
            },16)
        }
    </script>
</body>

</html>