[js]为什么画布里不出现图片呢？在线等

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<body>

</div>

function GED(ele) {return document.getElementById(ele);}

function load_source(url, w, h) {

this.canvas = document.createElement('canvas');

this.canvas.width = w;

this.canvas.height = h;

this.ctx = this.canvas.getContext('2d');

this.img = new Image();

this.img.src = url;

this.img.onload = function () {

this.ctx.drawImage(this.img, 0, 0);

}.bind(this);

return this.canvas;

}

source = new load_source('http://htmljs.b0.upaiyun.com/uploads/1382542991440-2angles.png', 300, 100);

canvas = document.createElement('canvas')

canvas.id = 'ff'

canvas.width = 300;

canvas.height = 100;

GED('main').appendChild(canvas);

ctxs = GED('ff').getContext('2d');

ctxs.drawImage(source, 110, 110);

</script>

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