JS运动基础


<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        #div1{
            width: 200px;
            height: 200px;
            background: red;
            position: absolute;
            top:50px;
            left: 0px;
        }
    </style>
    <script>
        function startMove(){
            var oDiv=document.getElementById('div1');
            setInterval(function(){
                    oDiv.style.left=oDiv.offsetLeft+10+'px';
                },30)
        }
    </script>
</head>
<body>
<input id="btn1" type="button" value="开始运动" onclick="startMove()">
    <div id="div1" ></div>
</input>
</body>
</html>

设置停顿位置和移动速度

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        #div1{
            width: 200px;
            height: 200px;
            background: red;
            position: absolute;
            top:50px;
            left: 0px;
        }
    </style>
    <script>
        //开启定时器
        var timer=null;
        function startMove(){
            var speed=3;
            var oDiv=document.getElementById('div1');
            timer=setInterval(function(){
                if(oDiv.offsetLeft>=300){//停顿位置
                    clearInterval(timer);
                }
                    oDiv.style.left=oDiv.offsetLeft+speed+'px';//speed是物体运动速度快慢
                },30);
        }
    </script>
</head>
<body>
<input id="btn1" type="button" value="开始运动" onclick="startMove()">
    <div id="div1" ></div>
</input>
</body>
</html>