图片加载函数

　　

 function imgLoad(imgURL,fn) {
        var imgArr = {};//存储图片
        var tempImg ; //临时存储图片;
        var loaded = 0; //当前已经加载完成几张
        var imageLength = 0;//要加载几张
        for (var key in imgURL) {
            imageLength++;
            tempImg = new Image();
            tempImg.onload = function () {
                loaded++;
                if(loaded >= imageLength){
                    fn(imgArr);
                }
            }
            tempImg.src = imgURL[key];
            imgArr[key] = tempImg;
        }
    }

调用的时候一个字母写错了 ,调试了 大半天  

 imgLoad({
        red:'./images/NPCrabbitbaby.png',
        blue:'./images/NPCrabbitbaby-2.png'
    },function(imgObj){
        cvs.drawImage(imgObj.red,10,10,100,100);
        cvs.drawImage(imgObj.blue,150,10,100,100);
    })