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如何在HTML 5中拖动光标图标？

window.app = {
  dragging: false,
  config: {
    canDrag: false,
    cursorOffsetX: null,
    cursorOffsetY: null
  },
  reset: function () {
    this.config.cursorOffsetX = null;
    this.config.cursorOffsetY = null;
  },
  start: function () {
    document.getElementById('target').addEventListener('mousedown', function (event) {
      console.log('+++++++++++++ dragstart');
      this.dragging = true;
      this.config.cursorOffsetX = event.offsetX;
      this.config.cursorOffsetY = event.offsetY;
      this.adjustPostion(event);
    }.bind(this));
    document.getElementById('target').addEventListener('mousemove', function (event) {
      if (this.dragging) {
        console.log('+++++++++++++ drag');
        event.target.style.cursor = 'move'; 
        this.adjustPostion(event);
      }
    }.bind(this));
    document.getElementById('target').addEventListener('mouseup', function (event) {
      console.log('+++++++++++++ dragend');
      this.dragging = false;
      event.target.style.cursor = 'pointer'; 
      this.reset();
    }.bind(this));
  },
  adjustPostion: function (event) {
    if (event.clientX <= 0 || event.clientY <= 0) {
      console.log('skipped');
      return;
    }
    var elm = document.getElementById('target');
    elm.style.left = (event.clientX - this.config.cursorOffsetX) + 'px';
    elm.style.top = (event.clientY - this.config.cursorOffsetY) + 'px';
    console.log(event.pageX);
    console.log(event.pageY);
  }

};

#target {
            position: absolute;
            top: 100px;
            left: 100px;
            width: 400px;
            height: 400px;
            background-color: red;
            -moz-user-select: none;
            -ms-user-select: none;
            -webkit-user-select: none;
            user-select: none;
        }

        #ui1 {
            position: absolute;
            top: 50px;
            left: 50px;
            width: 100px;
            height: 400px;
            background-color: blue;
            z-index: 100;
        }

        #ui2 {
            position: absolute;
            top: 50px;
            left: 550px;
            width: 100px;
            height: 400px;
            background-color: green;
            z-index: 100;
        }

<!-- simulate -->

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>title</title>
</head>
<body onload="window.app.start();">
    <div id="ui1"></div>
    <div id="ui2"></div>
    <div id="target"></div>
</body>
</html>

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原文地址：https://www.cnblogs.com/BluceLee/p/9317701.html