//判断图片是否加载完成
function isImgLoad(callback){
var imgs = $(".compareDiv img");
if(imgs.length == 0){
callback();
}else{
var timer = setInterval(function(){
var a = 0;
imgs.each(function(index,item){
if (item.complete) {
a= a+1;
}
if(a == imgs.length){
clearInterval(timer);
callback();
}
});
},50);
}
}
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