Corresponding to different themes need to change something, my topic is BeanTech.
Add about js code in place, I was themes\BeanTech\layout\_partialadded.
<script>
function createImgEventFullScreen() {
var imgs = $(".post-container").find("img");
console.log(imgs);
for (var i = 0; i < imgs.length; i++) {
// $(imgs[i]).click(createCover(imgs[i]));
imgs[i].onclick = function (e) {
var src = e.srcElement.currentSrc;
var _this = $(this);
console.log(_this);
createCover(src,_this);
}
}
function createCover(src,_this) {
console.log(_this);
console.log(src);
var cover = $("<div id='outerDiv' style='position:fixed;top:0;left:0;background:rgba(0,0,0,0.7);z-index:5;width:100%;height:100%;display:none;'><div id='innerDiv' style='position:absolute;'><img id='bigImg' style='border:5px solid #fff;' src=''/></div></div>");
$("#outerDiv").remove();
$("body").append(cover);
imgShow("#outerDiv", "#innerDiv", "#bigImg", _this,src);
}
}
function imgShow(outerDiv, innerDiv, bigImg, _this,src) {
//var src = _this.attr("src"); //获取当前点击的common-img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) { //如宽度仍大于窗口宽度
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
//console.log('****')
$(outerDiv).fadeIn("fast"); //淡入显示#outerDiv
});
$(outerDiv).click(function () { //再次点击淡出消失弹出层
$(this).fadeOut("fast");
});
}
setTimeout(function () {
createImgEventFullScreen();
}, 1000)
</script>
The js code applies to any topic, only you need to modify the content of the following theme for their choice just fine.
ar imgs = $(".post-container").find("img");
If my choice is post-container: 
it changed to post-container
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