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Front-end practice--JavaScript--animation (1)

黄舟Original: 2016-12-30 16:27:411528browse

Simple animation

Achievement effect:

Answer:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>简单动画</title>
    <style type="text/css">
        body,div,span{
            margin:0;
            padding;
        }
        #div1{
            width:200px;
            height:200px;
            background:red;
            position:relative;
            left:-200px;
            top:0;  
        }
        #div1 span{
            width:20px;
            height:50px;
            background:blue;
            position:absolute;
            left:200px;
            top:75px;
        }
    </style>
    <script>
/*      版本1.0--代码量大，函数没有参数，效率低
        window.onload = function(){
            var oDiv = document.getElementById(&#39;div1&#39;);
            oDiv.onmouseover = function(){
                startMove();
            }
            oDiv.onmouseout = function(){
                startMove1();
            }
        }
        var timer = null;
        function startMove(){
            clearInterval(timer);
            var oDiv = document.getElementById(&#39;div1&#39;);
            timer = setInterval(function(){
                if(oDiv.offsetLeft == 0){
                    clearInterval(timer);
                }else{
                    oDiv.style.left = oDiv.offsetLeft+10+&#39;px&#39;;
                }                           
            },30)
        }
        function startMove1(){
            clearInterval(timer);
            var oDiv = document.getElementById(&#39;div1&#39;);
            timer = setInterval(function(){
                if(oDiv.offsetLeft == -200){
                    clearInterval(timer);
                }else{
                    oDiv.style.left = oDiv.offsetLeft-10+&#39;px&#39;;
                }                           
            },30)
        } */
/*      版本2.0 startMove函数引入参数speed,iTarget，简化代码，提高代码质量
        window.onload = function(){
            var oDiv = document.getElementById(&#39;div1&#39;);
            oDiv.onmouseover = function(){
                startMove(10,0);
            }
            oDiv.onmouseout = function(){
                startMove(-10,-200);
            }
        }
        var timer = null;
        function startMove(speed,iTarget){
            clearInterval(timer);
            var oDiv = document.getElementById(&#39;div1&#39;);
            timer = setInterval(function(){
                if(oDiv.offsetLeft == iTarget){
                    clearInterval(timer);
                }else{
                    oDiv.style.left = oDiv.offsetLeft+speed+&#39;px&#39;;
                }                           
            },30)
        } */
        // 进一步优化代码，只引入一个参数

        window.onload = function(){
            var oDiv = document.getElementById(&#39;div1&#39;);
            oDiv.onmouseover = function(){
                startMove(0);
            }
            oDiv.onmouseout = function(){
                startMove(-200);
            }
        }
        var timer = null;
        // 参数iTarget，设置DIV移动的边界。
        // 取消由 setInterval()设置的每一次触发鼠标事件。
        // 设置DIV的运动。        
        function startMove(iTarget){
            clearInterval(timer);
            var oDiv = document.getElementById(&#39;div1&#39;);
            timer = setInterval(function(){
                var speed = 0;
                if(oDiv.offsetLeft > iTarget){
                    speed = -10;                    
                }else{
                    speed = 10;
                }
                if(oDiv.offsetLeft == iTarget){
                    clearInterval(timer);
                }else{
                    oDiv.style.left = oDiv.offsetLeft+speed+&#39;px&#39;;
                }                           
            },30)
        }
    </script>
</head>

<body>
    <div id="div1"> 
        <span id="share">分享</span>
    </div>
</body> 
</html>

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