html2canvas生成PNG图片并下载

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<script type="text/javascript" src="javascripts/html2canvas.js"></script>
<script type="text/javascript" src="javascripts/canvas2image.js"></script>
<script type="text/javascript" src="javascripts/base64.js"></script>
 <script type="text/javascript">
 var content = document.getElementById("mainB"); 
 
// 进行canvas生成
function btnSave(){
	html2canvas(content, {
        onrendered: function(canvas) {
        	//添加属性
        	canvas.setAttribute('id','thecanvas');
			//读取属性值
			// var value= canvas.getAttribute('id');
            document.getElementById('images').appendChild(canvas);
            Download();
        }
	});
} 
function Download(){
	var oCanvas = document.getElementById("thecanvas");
	/*自动保存为png*/
	// 获取图片资源
	var img_data1 = Canvas2Image.saveAsPNG(oCanvas, true).getAttribute('src');
	saveFile(img_data1, 'img');


	
}    
function saveFile(data, filename){
    var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a');
    save_link.href = data;
    save_link.download = filename;
   
    var event = document.createEvent('MouseEvents');
    event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
    save_link.dispatchEvent(event);
};
	
</script>