JS生成二维码(基于jquery.qrcode)

al.qrcode = function(tar,config){
	var width = 200;
	var height = 200;
	var lvl = 0;
	var text = "";
	if(config){
		width = config['width'] || width;
		height = config['height'] || height;
		lvl = config['lvl'] || lvl;
		text = config['text'];
	}
	al.load.script('////cdn.anyline.org/plugin/jquery.qrcode.min.js',function(){
		tar = $(tar);
		tar.qrcode({width:width,height:height,correctLevel:lvl,text:text});

		function convertCanvasToImage(canvas) {
			//新Image对象，可以理解为DOM
			var image = new Image();
			// canvas.toDataURL 返回的是一串Base64编码的URL，当然,浏览器自己肯定支持
			// 指定格式 PNG
			image.src = canvas.toDataURL("image/png");
			return image;
		}
		var alCanvas=document.getElementsByTagName('canvas')[0];
		alCanvas.style.display = 'none'//隐藏生成的canvas
		//将转换后的img标签插入到html中
		var img=convertCanvasToImage(alCanvas);
		tar.append(img);//imagQrDiv表示你要插入的容器id
		//从 canvas 提取图片 image
	});
}

al.open({ title:'微信扫描预览', content:'<div style="width:200px;height:200px;" id="qrcode"></div>' }); al.qrcode('#qrcode');