//图片加载
function load(imgSrc,callback) {
  var imgs = [];
  var c = 0;
  for (var i = 0; i < imgSrc.length; i++) {
    imgs[i] = new Image();
    imgs[i].src = imgSrc[i];
    imgs[i].onload = function(){
      c++
    if(c == imgSrc.length){
      if(callback){
        callback();
      }
     }
    }
  }
  return imgs;
}

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