图片跟随鼠标移动效果实现

html代码

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<img src="1.jpg" alt="" id="img" />

css代码

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*{
    margin: 0;
    padding: 0;
  }
  body{
    height: 2000px;
  }
  img{
    position: absolute;
  }

JavaScript代码

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var move = {
  // window.event和事件参数对象e的兼容
  getEvent: function (event) {
    return window.event || event;
  },
  // 可视区域的横坐标的兼容代码
  getClientX: function (event) {
    return this.getEvent(event).clientX;
  },
  // 可视区域的纵坐标的兼容代码
  getClientY: function (event) {
    return this.getEvent(event).clientY;
  },
  // 页面向左卷曲出去的横坐标
  getScrollLeft: function () {
    return window.pageXOffset || document.body.scrollLeft
    || document.documentElement.scrollLeft || 0;
  },
  // 页面向上卷曲出去的纵坐标
  getScrollTop: function () {
    return window.pageYOffset || document.body.scrollTop
    || document.documentElement.scrollTop || 0;
  },
  // 相对于页面的横坐标(pageX或者是clientX + scrollLeft)
  getPageX: function (event) {
    return this.getEvent(event).pageX ? this.getEvent(event).pageX:
    this.getClientX(event) + this.getScrollLeft();
  },
  // 相对于页面的纵坐标(pageY或者是clientY + scrollTop)
  getPageY: function (event) {
    return this.getEvent(event).pageY ? this.getEvent(event).pageY:
    this.getClientY(event) + this.getScrollTop();
  }
};

document.onmousemove = function (event) {
  document.getElementById("img").style.left = move.getPageX(event)+"px";
  document.getElementById("img").style.top = move.getPageY(event)+"px";
};