JS 获取图片Base64
1JS
	/*JS 获取图片Base64	
	function getImageBase64(img, ext) {
		canvas=document.getElementById('myCanvas');
		canvas.width = img.width;
		canvas.height = img.height;
		ctx=canvas.getContext('2d');
		ctx.drawImage(img, 0, 0, img.width, img.height); //使用画布画图
		dataURL = canvas.toDataURL("image/" + ext);  //返回的是一串Base64编码的URL并指定格式
		canvas = null; //释放
		return dataURL;
	}
		

	fileExt='image/png';	
	var user_icon = document.getElementById('authcode_img');//图片容器
	user_icon.src = $("#authcode_img").attr('src'); //指定图片路径
	user_icon.onload = function () {
		base64 = getImageBase64(user_icon, fileExt);    //base64编码
		console.log('base64:'+base64);
	}	
	*/
2HTML
<canvas id="myCanvas">your browser does not support the canvas tag </canvas>
<img id=authcode_img src=https://www.monxin.com/logo.png />
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