zoukankan      html  css  js  c++  java
  • js拖动div

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <meta http-equiv="X-UA-Compatible" content="ie=edge">
        <title>Document</title>
        <style>
            div{
                position: relative;
                border:1px solid red;
                200px;
                height:200px;
            }
        </style>
    </head>
    <body>
        <div id="dv">
           ddddddd
        </div>
    
        <script>
            //获取元素
            var dv = document.getElementById('dv');
            var x = 0;
            var y = 0;
            var l = 0;
            var t = 0;
            var isDown = false;
            //鼠标按下事件
            dv.onmousedown = function(e) {
                //获取x坐标和y坐标
                x = e.clientX;
                y = e.clientY;
    
                //获取左部和顶部的偏移量
                l = dv.offsetLeft;
                t = dv.offsetTop;
                //开关打开
                isDown = true;
                //设置样式  
                dv.style.cursor = 'move';
            }
            //鼠标移动
            window.onmousemove = function(e) {
                if (isDown == false) {
                    return;
                }
                //获取x和y
                var nx = e.clientX;
                var ny = e.clientY;
                //计算移动后的左偏移量和顶部的偏移量
                var nl = nx - (x - l);
                var nt = ny - (y - t);
    
                dv.style.left = nl + 'px';
                dv.style.top = nt + 'px';
            }
            //鼠标抬起事件
            dv.onmouseup = function() {
                //开关关闭
                isDown = false;
                dv.style.cursor = 'default';
            }
        </script>
    </body>
    </html>
  • 相关阅读:
    RS232串口通信详解
    VS2010 常用的快捷键
    Qt .pro文件详解
    Qt 编译出现 error LNK2019: 无法解析的外部符号
    LabVIEW部分视觉函数中文解说
    NI Vision 介绍
    LabVIEW的优点
    VisionPro和Halcon的详细对比
    康耐视软件VisionPro-max-u与VisionPro-plus-u的区别
    TensorFlow 介绍
  • 原文地址:https://www.cnblogs.com/huandong963/p/12256017.html
Copyright © 2011-2022 走看看