var containerCanvas = document.createElement ("canvas");
//752 22502
containerCanvas.width = 752;
containerCanvas.height = 22502;
var context = containerCanvas.getContext ("2d");
//然后将画布缩放，将图像放大两倍画到画布上
context.scale (2, 2);
var data = containerCanvas.toDataURL();
console.log("containerCanvas.toDataURL();---->"+data);
以上代码在网页中正常打印,在手机上,打印的data为 data:,
如果把containerCanvas.height = 22502;这句改成containerCanvas.height = 21502;则在手机和网页中都正常打印出来值
请问是什么原因?