图片的滑动缩放html、css、js代码

时间：2021-10-17 03:28:05
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    #box {
      width: 100px;
      height: 100px;
      background-color: aquamarine;
      position: absolute;
    }
    #father {
      width: 600px;
      height: 500px;
      background-color: rgb(226, 117, 184);
      position: relative;
    }
    img {
      width: 100%;
      height: 100%;
      cursor: move;
    }
    #scale {
      width: 10px;
      height: 10px;
      overflow: hidden;
      cursor: se-resize;
      position: absolute;
      right: 0;
      bottom: 0;
      background-color: rgb(122, 191, 238);
    }
  </style>

</head>
<body>
<div id="father">
  <div id="box">
    <img src='./src/assets/logo.png'/>
    <div id="scale"></div>
  </div>
</div>

</body>
</html>
<script type="text/javascript">
  // box是装图片的容器,fa是图片移动缩放的范围,scale是控制缩放的小图标
  var box = document.getElementById("box");
  var fa = document.getElementById('father');
  var scale = document.getElementById("scale");
  // 图片移动效果
  box.onmousedown=function(ev) {
    var oEvent = ev;
    // 浏览器有一些图片的默认事件,这里要阻止
    oEvent.preventDefault();
    var disX = oEvent.clientX - box.offsetLeft;
    var disY = oEvent.clientY - box.offsetTop;
    console.log(disX,disY)
    fa.onmousemove=function (ev) {
      oEvent = ev;
      oEvent.preventDefault();
      var x = oEvent.clientX -disX;
      var y = oEvent.clientY -disY;
      console.log(x,y)

      // 图形移动的边界判断
      x = x <= 0 ? 0 : x;
      x = x >= fa.offsetWidth-box.offsetWidth ? fa.offsetWidth-box.offsetWidth : x;
      y = y <= 0 ? 0 : y;
      y = y >= fa.offsetHeight-box.offsetHeight ? fa.offsetHeight-box.offsetHeight : y;
      box.style.left = x + 'px';
      box.style.top = y + 'px';
    }
    // 图形移出父盒子取消移动事件,防止移动过快触发鼠标移出事件,导致鼠标弹起事件失效
    fa.onmouseleave = function () {
      fa.onmousemove=null;
      fa.onmouseup=null;
    }
    // 鼠标弹起后停止移动
    fa.onmouseup=function() {
      fa.onmousemove=null;
      fa.onmouseup=null;
    }
  }
  // 图片缩放效果
  scale.onmousedown = function (e) {
    // 阻止冒泡,避免缩放时触发移动事件
    e.stopPropagation();
    e.preventDefault();
    var pos = {
      'w': box.offsetWidth,
      'h': box.offsetHeight,
      'x': e.clientX,
      'y': e.clientY
    };
    fa.onmousemove = function (ev) {
      ev.preventDefault();
      // 设置图片的最小缩放为30*30
      var w = Math.max(30, ev.clientX - pos.x + pos.w)
      var h = Math.max(30,ev.clientY - pos.y + pos.h)
      // console.log(w,h)

      // 设置图片的最大宽高
      w = w >= fa.offsetWidth-box.offsetLeft ? fa.offsetWidth-box.offsetLeft : w
      h = h >= fa.offsetHeight-box.offsetTop ? fa.offsetHeight-box.offsetTop : h
      box.style.width = w + 'px';
      box.style.height = h + 'px';
      // console.log(box.offsetWidth,box.offsetHeight)
    }
    fa.onmouseleave = function () {
      fa.onmousemove=null;
      fa.onmouseup=null;
    }
    fa.onmouseup=function() {
      fa.onmousemove=null;
      fa.onmouseup=null;
    }
  }

</script>
 

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