var p_w_picpathLoader = {        loaded:true,        loadedImages:0,        totalImages:0,        load:function(url){            this.totalImages++;            this.loaded = false;            var p_w_picpath = new Image();            p_w_picpath.src = url;            p_w_picpath.onload = function(){//图片加载后调用的图片                p_w_picpathLoader.loadedImages++;                if(p_w_picpathLoader.loadedImages === p_w_picpathLoader.totalImages){                    p_w_picpathLoader.loaded = true;                }            }            return p_w_picpath;        }    };    function pageLoaded(){        var canvas = document.getElementById('testcanvas');//得到画布        var context = canvas.getContext('2d');//得到绘图环境  参数为绘图环境的类型        p_w_picpathLoader.loaded = false;        var p_w_picpath_gx1 = p_w_picpathLoader.load('/testimg/gx/gx1.png');        var p_w_picpath_gx2 = p_w_picpathLoader.load('/testimg/gx/gx2.jpg');        var p_w_picpath_gx3 = p_w_picpathLoader.load('/testimg/gx/gx3.jpg');        var p_w_picpath_gx4 = p_w_picpathLoader.load('/testimg/gx/gx4.jpg');        var interHandler = setInterval(function () {            if(p_w_picpathLoader.loaded){                context.drawImage(p_w_picpath_gx1,0,0,100,100);                context.drawImage(p_w_picpath_gx2,101,0,100,100);                context.drawImage(p_w_picpath_gx3,201,0,100,100);                context.drawImage(p_w_picpath_gx4,301,0,100,100);                clearInterval(interHandler)            }        },50);    }