• js 实现弹性运动的简单应用----导航栏中弹性


    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>无标题文档</title>
    <style>
        body,ul{margin:0;padding:0;}
        ul{width:400px;height:30px;position:relative;margin:20px auto;}
        li{width:98px;height:28px;border:1px solid black;float:left;line-height:28px;text-align:center;list-style:none;}
        .bg{width:100px;height:5px;background:red;position:absolute;left:0;bottom:0;overflow:hidden;border:none;}
    </style>
    <script>
        window.onload =function(){
            var oUl = document.getElementsByTagName('ul')[0];
            var arrLi = oUl.getElementsByTagName('li');
            var oBg = arrLi[arrLi.length-1];
            for(var i=0;i<arrLi.length-1;i++){
                arrLi[i].onmouseover = function(){
                    elasticStartMove(oBg,this.offsetLeft);
                };
            }
            
        };
    
        var left = 0; /*必须放在外面,解决小数误差问题*/
        function elasticStartMove(obj,target){
            var speed = 0;
            clearInterval(obj.timer);
            obj.timer = setInterval(function(){
                speed += (target-obj.offsetLeft)/5;
                speed *= 0.75;
                left += speed;
                if(Math.abs(speed) < 1 && Math.abs(left-target) < 1){ /*停止的条件*/
                    clearInterval(obj.timer);
                    obj.style.left = target+'px';
                }
                    
                obj.style.left=left+'px';
                document.title="speed:"+speed+" -  :"+Math.abs(left-target);
                
            },30);
        }
        /*
            弹性公式:
                速度 +=(目标值-oDiv.offsetLeft)/5
                速度*=0.7;
            不适用范围:对于有一些height不能取负数的不能使用    
        */
    </script>
    </head>
    
    <body>
    <ul>
        <li>首页</li>
        <li>产品</li>
        <li>关于我们</li>
        <li>联系方式</li>
        <li class='bg'></li>
    </ul>
    </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/moon-yyl/p/9021926.html
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