H5第一章拖拽

1.H5是属于移动端的,不存在兼容问题,在HTML中写上draggable=“true” 打开元素,可以拖拽元素,下面就用一段代码来进行展示

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>拖拽</title>
    <style>
        #box{
            width: 300px;
            height: 150px;
            background-color: pink;
            position: absolute;
            left: 100px;
            top:50px;
        }
    </style>
</head>
<body>
<div id="box" draggable="true">

</div>
<script>
    //第三阶段都是移动端的,不存在兼容问题
    //draggable="true" 打开元素,可以拖拽元素
    let box = document.getElementById('box');
    //按下 拖拽的写法 原生拖拽的写法
    // box.onmousedown = function (e) {
    //     let x = e.clientX - this.offsetLeft;
    //     let y = e.clientY - this.offsetHeight;
    //
    //     //移动
    //     document.onmousemove = function (e) {
    //         box.style.cssText = `left:${e.clientX-x}px;top:${e.clientY-y}px`;
    //     }
    //     document.onmouseup = function () {
    //         document.onmousemove = null;
    //         document.onmouseup = null;
    //     }
    // }

    //H5写法
    //拖拽
   box.ondragover = function (e) {
       this.style.cssText = `left:${e.clientX-100}px;top:${e.clientY-100}px`;


   };
   //拖拽结束
   box.ondragend = function (e) {
       this.style.cssText = `left:${e.clientX-100}px;top:${e.clientY-100}px`;
   }
   //拖拽7个事件
</script>
</body>
</html>

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转载自blog.csdn.net/weixin_42355871/article/details/85016005