var can = $$('can');
var cans = can.getContext('2d');
window.location=cans.canvas.toDataURL('image/png');
var can = $$('can');
var cans = can.getContext('2d');
window.location=cans.canvas.toDataURL('image/png');
转载于:https://www.cnblogs.com/picaso/archive/2012/11/27/2791304.html