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js实现点击图片在屏幕中间弹出放大效果

程序员文章站 2022-04-18 18:08:21
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

js实现点击图片在屏幕中间弹出放大效果

效果图

js实现点击图片在屏幕中间弹出放大效果

点击图片后

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

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

js实现点击图片在屏幕中间弹出放大效果

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

以上所述是小编给大家介绍的js实现点击图片在屏幕中间弹出放大效果,希望对大家有所帮助