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
我要评论
<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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c=jb(a,"opacity");return""===c?"1":c}}}},cssnumber:{columncount:!0,fillopacity:!0,flexgrow:!0,flexshrink:!0,fontweight:!0,lineheight:!0,opacity:!0,order:!0,orphans:!0,widows:!0,zindex:!0,zoom:!0},cssprops:{"float":k.cssfloat?"cssfloat":"stylefloat"},style:function(a,b,c,d){if(a&&3!==a.nodetype&&8!==a.nodetype&&a.style){var e,f,g,h=m.camelcase(b),i=a.style;if(b=m.cssprops[h]||(m.cssprops[h]=ub(i,h)),g=m.csshooks[b]||m.csshooks[h],void 0===c)return g&&"get"in g&&void 0!==(e=g.get(a,!1,d))?e:i[b];if(f=typeof c,"string"===f&&(e=qb.exec(c))&&(c=(e[1]+1)*e[2]+parsefloat(m.css(a,b)),f="number"),null!=c&&c===c&&("number"!==f||m.cssnumber[h]||(c+="px"),k.clearclonestyle||""!==c||0!==b.indexof("background")||(i[b]="inherit"),!(g&&"set"in g&&void 0===(c=g.set(a,c,d)))))try{i[b]=c}catch(j){}}},css:function(a,b,c,d){var e,f,g,h=m.camelcase(b);return b=m.cssprops[h]||(m.cssprops[h]=ub(a.style,h)),g=m.csshooks[b]||m.csshooks[h],g&&"get"in g&&(f=g.get(a,!0,c)),void 0===f&&(f=jb(a,b,d)),"normal"===f&&b in sb&&(f=sb[b]),""===c||c?(e=parsefloat(f),c===!0||m.isnumeric(e)?e||0:f):f}}),m.each(["height","width"],function(a,b){m.csshooks[b]={get:function(a,c,d){return c?ob.test(m.css(a,"display"))&&0===a.offsetwidth?m.swap(a,rb,function(){return yb(a,b,d)}):yb(a,b,d):void 0},set:function(a,c,d){var e=d&&ib(a);return wb(a,c,d?xb(a,b,d,k.boxsizing&&"border-box"===m.css(a,"boxsizing",!1,e),e):0)}}}),k.opacity||(m.csshooks.opacity={get:function(a,b){return nb.test((b&&a.currentstyle?a.currentstyle.filter:a.style.filter)||"")?.01*parsefloat(regexp.$1)+"":b?"1":""},set:function(a,b){var c=a.style,d=a.currentstyle,e=m.isnumeric(b)?"alpha(opacity="+100*b+")":"",f=d&&d.filter||c.filter||"";c.zoom=1,(b>=1||""===b)&&""===m.trim(f.replace(mb,""))&&c.removeattribute&&(c.removeattribute("filter"),""===b||d&&!d.filter)||(c.filter=mb.test(f)?f.replace(mb,e):f+" "+e)}}),m.csshooks.marginright=lb(k.reliablemarginright,function(a,b){return b?m.swap(a,{display:"inline-block"},jb,[a,"marginright"]):void 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},cur:function(){var a=zb.prophooks[this.prop];return a&&a.get?a.get(this):zb.prophooks._default.get(this)},run:function(a){var b,c=z
总结
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