Question

js中NaN用二进制如何表示

我们知道任何类型的值，最后都可以用二进制表示 ，我想问NaN如何用二进制表示 ？

Answer 1

方法如下。
function convertImgToBase64(url, callback, outputFormat)
{var canvas = document.createElement('CANVAS'),
ctx = canvas.getContext('2d'),

img = new Image;

img.crossOrigin = 'Anonymous';

img.onload = function(){canvas.height = img.height;

canvas.width = img.width;

ctx.drawImage(img,0,0);

var dataURL = canvas.toDataURL(outputFormat || 'image/png');

callback.call(this, dataURL);

canvas = null; };
img.src = url;}