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;
            margin-top: 20px;
        }
    </style>
</head>

<body>
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
    <script>
        var aBox = document.getElementsByClassName("box");
        var timer1 = null;
        for (var i = 0; i < aBox.length; i++) {
            aBox[i].index = i;
            aBox[i].onmouseover = function () {
                var _index = this.index;
                clearInterval(aBox[_index].timer2)
                aBox[_index].timer1 = setInterval(function () {
                    var _width = aBox[_index].offsetWidth;
                    if (_width >= 600) {
                        clearInterval(aBox[_index].timer1)
                    } else {
                        _width += 10;
                        aBox[_index].style.width = _width + "px";
                    }
                }, 16)
            }

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

</html>