js运动原理和拖拽原理 - 作业

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实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>js运动原理</title>
    <style>
        .ball1{
            width: 100px;
            height: 100px;
            background-color: aquamarine;
            border-radius: 50%; 
            position: absolute;
            top:50px;
            left:50px;
        }
    </style>
</head>
<body>
    <button>动起来</button>
    <button onclick="reset()">复位</button>
    <div class="ball1"></div>

    <script>
        var btn  = document.querySelector('button');
        var ball1 = document.getElementsByClassName('ball1')[0];
        var timer = null;
        btn.onclick = function(){
            clearInterval(timer);
            
            timer = setInterval(function() {
                
                if(ball1.offsetLeft < 500){
                    ball1.style.left = ball1.offsetLeft+5+'px';
                    
                }else{
                    clearInterval(timer); 
                }
               
            },100);
        }

        function reset() {
            clearInterval(timer);
            ball1.style.left = '50px';
        }
    </script>
</body>
</html>

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2、拖拽原理：分三个动作，选中移动放下

实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>拖拽</title>
    <style>
        .ball2{
            width: 100px;
            height: 100px;
            background-color: aquamarine;
            border-radius: 50%; 
            position: absolute;
            top:100px;
            left:100px;
        }
       
    </style>
</head>
<body>
    <div class="ball2"></div>
</body>
<script>
    //onmousedown 选中  onmousemove 移动  onmouseup 放下
    var ball2 = document.getElementsByClassName('ball2')[0];
    //event.clientX 鼠标横轴 event.clientY鼠标纵轴
    ball2.onmousedown = function (event) {
        var x = event.clientX - ball2.offsetLeft;
        var y = event.clientY - ball2.offsetTop;
        document.onmousemove = function(event) {

            ball2.style.left = event.clientX - x +'px';
            ball2.style.top  = event.clientY - y +'px';
            
        }
        document.onmouseup  = function() {
            document.onmousemove = null;
        }
    }
</script>
</html>

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