js实现点击图片在屏幕中间弹出放大效果

js实现点击图片在屏幕中间弹出放大效果

效果图

点击图片后

关键代码

html

<div>
    <img height="100" width="100" src="https://cdn.pixabay.com/photo/2018/08/14/13/23/ocean-3605547_960_720.jpg" class="pic"/>
    <img height="100" width="100" src="https://cdn.pixabay.com/photo/2011/12/14/12/21/orion-nebula-11107_960_720.jpg" class="pic"/>
    <img height="100" width="100" src="https://cdn.pixabay.com/photo/2017/08/30/01/05/milky-way-2695569_960_720.jpg" class="pic"/>
  </div>
  <div id="outerdiv" style="position:fixed;top:0;left:0;background:rgba(0,0,0,0.7);z-index:2;width:100%;height:100%;display:none;">
  <div id="innerdiv" style="position:absolute;">
    <img id="bigimg" style="border:5px solid #fff;" src="" />
  </div>

js

<script src="./jquery.min.js"></script>
<script type="text/javascript">

 $(function(){
    $(".pic").click(function(){
      var _this = $(this);//将当前的pimg元素作为_this传入函数
      imgShow("#outerdiv", "#innerdiv", "#bigimg", _this);
    });
  });
  function imgShow(outerdiv, innerdiv, bigimg, _this){
    var src = _this.attr("src");//获取当前点击的pimg元素中的src属性
    $(bigimg).attr("src", src);//设置#bigimg元素的src属性
      /*获取当前点击图片的真实大小，并显示弹出层及大图*/
    $("<img/>").attr("src", src).load(function(){
      var windowW = $(window).width();//获取当前窗口宽度
      var windowH = $(window).height();//获取当前窗口高度
      var realWidth = this.width;//获取图片真实宽度
      var realHeight = this.height;//获取图片真实高度
      var imgWidth, imgHeight;
      var scale = 0.8;//缩放尺寸，当图片真实宽度和高度大于窗口宽度和高度时进行缩放
      if(realHeight>windowH*scale) {//判断图片高度
        imgHeight = windowH*scale;//如大于窗口高度，图片高度进行缩放
        imgWidth = imgHeight/realHeight*realWidth;//等比例缩放宽度
        if(imgWidth>windowW*scale) {//如宽度扔大于窗口宽度
          imgWidth = windowW*scale;//再对宽度进行缩放
        }
      } else if(realWidth>windowW*scale) {//如图片高度合适，判断图片宽度
        imgWidth = windowW*scale;//如大于窗口宽度，图片宽度进行缩放
              imgHeight = imgWidth/realWidth*realHeight;//等比例缩放高度
      } else {//如果图片真实高度和宽度都符合要求，高宽不变
        imgWidth = realWidth;
        imgHeight = realHeight;
      }
          $(bigimg).css("width",imgWidth);//以最终的宽度对图片缩放
      var w = (windowW-imgWidth)/2;//计算图片与窗口左边距
      var h = (windowH-imgHeight)/2;//计算图片与窗口上边距
      $(innerdiv).css({"top":h, "left":w});//设置#innerdiv的top和left属性
      $(outerdiv).fadeIn("fast");//淡入显示#outerdiv及.pimg
    });
    $(outerdiv).click(function(){//再次点击淡出消失弹出层
      $(this).fadeOut("fast");
    });
  }

</script>

使用方式

将以下两个文件放在同一个文件夹下，使用浏览器打开1.html

完整代码

完整1.html

<html>
<head>
<script src="./jquery.min.js"></script>
<script type="text/javascript">

 $(function(){
    $(".pic").click(function(){
      var _this = $(this);//将当前的pimg元素作为_this传入函数
      imgShow("#outerdiv", "#innerdiv", "#bigimg", _this);
    });
  });
  function imgShow(outerdiv, innerdiv, bigimg, _this){
    var src = _this.attr("src");//获取当前点击的pimg元素中的src属性
    $(bigimg).attr("src", src);//设置#bigimg元素的src属性
      /*获取当前点击图片的真实大小，并显示弹出层及大图*/
    $("<img/>").attr("src", src).load(function(){
      var windowW = $(window).width();//获取当前窗口宽度
      var windowH = $(window).height();//获取当前窗口高度
      var realWidth = this.width;//获取图片真实宽度
      var realHeight = this.height;//获取图片真实高度
      var imgWidth, imgHeight;
      var scale = 0.8;//缩放尺寸，当图片真实宽度和高度大于窗口宽度和高度时进行缩放
      if(realHeight>windowH*scale) {//判断图片高度
        imgHeight = windowH*scale;//如大于窗口高度，图片高度进行缩放
        imgWidth = imgHeight/realHeight*realWidth;//等比例缩放宽度
        if(imgWidth>windowW*scale) {//如宽度扔大于窗口宽度
          imgWidth = windowW*scale;//再对宽度进行缩放
        }
      } else if(realWidth>windowW*scale) {//如图片高度合适，判断图片宽度
        imgWidth = windowW*scale;//如大于窗口宽度，图片宽度进行缩放
              imgHeight = imgWidth/realWidth*realHeight;//等比例缩放高度
      } else {//如果图片真实高度和宽度都符合要求，高宽不变
        imgWidth = realWidth;
        imgHeight = realHeight;
      }
          $(bigimg).css("width",imgWidth);//以最终的宽度对图片缩放
      var w = (windowW-imgWidth)/2;//计算图片与窗口左边距
      var h = (windowH-imgHeight)/2;//计算图片与窗口上边距
      $(innerdiv).css({"top":h, "left":w});//设置#innerdiv的top和left属性
      $(outerdiv).fadeIn("fast");//淡入显示#outerdiv及.pimg
    });
    $(outerdiv).click(function(){//再次点击淡出消失弹出层
      $(this).fadeOut("fast");
    });
  }

</script>
</head>
<body>
<div>
    <img height="100" width="100" src="https://cdn.pixabay.com/photo/2018/08/14/13/23/ocean-3605547_960_720.jpg" class="pic"/>
    <img height="100" width="100" src="https://cdn.pixabay.com/photo/2011/12/14/12/21/orion-nebula-11107_960_720.jpg" class="pic"/>
    <img height="100" width="100" src="https://cdn.pixabay.com/photo/2017/08/30/01/05/milky-way-2695569_960_720.jpg" class="pic"/>
  </div>
  <div id="outerdiv" style="position:fixed;top:0;left:0;background:rgba(0,0,0,0.7);z-index:2;width:100%;height:100%;display:none;">
  <div id="innerdiv" style="position:absolute;">
    <img id="bigimg" style="border:5px solid #fff;" src="" />
  </div>

</body>
</html>

jquery.min.js (常规jquery包)

/*! jQuery v1.11.1 | (c) 2005, 2014 jQuery Foundation, Inc. | jquery.org/license */
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总结

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