js實現(xiàn)點擊圖片在屏幕中間彈出放大效果
更新時間：2019年09月11日 15:27:24 作者：張小凡vip
這篇文章主要介紹了js實現(xiàn)點擊圖片在屏幕中間彈出放大效果,非常不錯，具有一定的參考借鑒價值，需要的朋友可以參考下
js實現(xiàn)點擊圖片在屏幕中間彈出放大效果
效果圖
點擊圖片后
關鍵代碼
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);//將當前的pimg元素作為_this傳入函數(shù)
imgShow("#outerdiv", "#innerdiv", "#bigimg", _this);
});
});
function imgShow(outerdiv, innerdiv, bigimg, _this){
var src = _this.attr("src");//獲取當前點擊的pimg元素中的src屬性
$(bigimg).attr("src", src);//設置#bigimg元素的src屬性
/*獲取當前點擊圖片的真實大小，并顯示彈出層及大圖*/
$("<img/>").attr("src", src).load(function(){
var windowW = $(window).width();//獲取當前窗口寬度
var windowH = $(window).height();//獲取當前窗口高度
var realWidth = this.width;//獲取圖片真實寬度
var realHeight = this.height;//獲取圖片真實高度
var imgWidth, imgHeight;
var scale = 0.8;//縮放尺寸，當圖片真實寬度和高度大于窗口寬度和高度時進行縮放
if(realHeight>windowH*scale) {//判斷圖片高度
imgHeight = windowH*scale;//如大于窗口高度，圖片高度進行縮放
imgWidth = imgHeight/realHeight*realWidth;//等比例縮放寬度
if(imgWidth>windowW*scale) {//如寬度扔大于窗口寬度
imgWidth = windowW*scale;//再對寬度進行縮放
}
} else if(realWidth>windowW*scale) {//如圖片高度合適，判斷圖片寬度
imgWidth = windowW*scale;//如大于窗口寬度，圖片寬度進行縮放
imgHeight = imgWidth/realWidth*realHeight;//等比例縮放高度
} else {//如果圖片真實高度和寬度都符合要求，高寬不變
imgWidth = realWidth;
imgHeight = realHeight;
}
$(bigimg).css("width",imgWidth);//以最終的寬度對圖片縮放
var w = (windowW-imgWidth)/2;//計算圖片與窗口左邊距
var h = (windowH-imgHeight)/2;//計算圖片與窗口上邊距
$(innerdiv).css({"top":h, "left":w});//設置#innerdiv的top和left屬性
$(outerdiv).fadeIn("fast");//淡入顯示#outerdiv及.pimg
});
$(outerdiv).click(function(){//再次點擊淡出消失彈出層
$(this).fadeOut("fast");
});
}
</script>
使用方式
將以下兩個文件放在同一個文件夾下，使用瀏覽器打開1.html
完整代碼
完整1.html
<html>
<head>
<script src="./jquery.min.js"></script>
<script type="text/javascript">
$(function(){
$(".pic").click(function(){
var _this = $(this);//將當前的pimg元素作為_this傳入函數(shù)
imgShow("#outerdiv", "#innerdiv", "#bigimg", _this);
});
});
function imgShow(outerdiv, innerdiv, bigimg, _this){
var src = _this.attr("src");//獲取當前點擊的pimg元素中的src屬性
$(bigimg).attr("src", src);//設置#bigimg元素的src屬性
/*獲取當前點擊圖片的真實大小，并顯示彈出層及大圖*/
$("<img/>").attr("src", src).load(function(){
var windowW = $(window).width();//獲取當前窗口寬度
var windowH = $(window).height();//獲取當前窗口高度
var realWidth = this.width;//獲取圖片真實寬度
var realHeight = this.height;//獲取圖片真實高度
var imgWidth, imgHeight;
var scale = 0.8;//縮放尺寸，當圖片真實寬度和高度大于窗口寬度和高度時進行縮放
if(realHeight>windowH*scale) {//判斷圖片高度
imgHeight = windowH*scale;//如大于窗口高度，圖片高度進行縮放
imgWidth = imgHeight/realHeight*realWidth;//等比例縮放寬度
if(imgWidth>windowW*scale) {//如寬度扔大于窗口寬度
imgWidth = windowW*scale;//再對寬度進行縮放
}
} else if(realWidth>windowW*scale) {//如圖片高度合適，判斷圖片寬度
imgWidth = windowW*scale;//如大于窗口寬度，圖片寬度進行縮放
imgHeight = imgWidth/realWidth*realHeight;//等比例縮放高度
} else {//如果圖片真實高度和寬度都符合要求，高寬不變
imgWidth = realWidth;
imgHeight = realHeight;
}
$(bigimg).css("width",imgWidth);//以最終的寬度對圖片縮放
var w = (windowW-imgWidth)/2;//計算圖片與窗口左邊距
var h = (windowH-imgHeight)/2;//計算圖片與窗口上邊距
$(innerdiv).css({"top":h, "left":w});//設置#innerdiv的top和left屬性
$(outerdiv).fadeIn("fast");//淡入顯示#outerdiv及.pimg
});
$(outerdiv).click(function(){//再次點擊淡出消失彈出層
$(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 (常規(guī)jquery包)
/*! jQuery v1.11.1 | (c) 2005, 2014 jQuery Foundation, Inc. | jquery.org/license */
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總結
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