<html xmlns="http://www.w3.org/1999/xhtml">
<head>
???<script type="text/javascript" src="jquery-1.7.2.min.js"/>
???<script type="text/javascript" src="html2canvas.js"/>
</head>
<body>
<a id="down_load_hidden" target="blank" style="display: none;"></a>
<a id="down_button" href="javascript:void(0)" onclick="domShot(‘qqCont‘)">保存当前页</a>
<div id="qqCont" class="qqCont">
???需要截图的样式
</div>
<script>
???/**
????* 调用html2canvas框架进行截图下载功能
????* @param domId 容器Id
????* author Levin
????*/
???function domShot(domId) {
???????//0.5.0-beta4方法
???????html2canvas(document.querySelector("#" + domId), {
???????????allowTaint: true,
???????????height: $("#" + domId).outerHeight() + 20
???????}).then(function (canvas) {
???????????var timestamp = Date.parse(new Date());
???????????$(‘#down_button‘).attr(‘href‘, canvas.toDataURL());
???????????$(‘#down_button‘).attr(‘download‘, timestamp + ‘.png‘);
???????????var fileObj = document.getElementById("down_load_hidden");
???????????fileObj.click();
???????});
???}
</script>
//一般情况html2canvas.js中的截取部分不支持取全部截取 所以要将页面所有部分截取得 修改html2canvas.js中的一下部分
//未修改前
<script>
???return renderDocument(node.ownerDocument, options, node.ownerDocument.defaultView.innerWidth, node.ownerDocument.defaultView.innerHeight, index).then(function(canvas) {
???????if (typeof(options.onrendered) === "function") {
???????????log("options.onrendered is deprecated, html2canvas returns a Promise containing the canvas");
???????????options.onrendered(canvas);
???????}
???????return canvas;
???});
</script>
//修改后
<script>
//添加自定设置宽度高度
???var width = options.width != null ? options.width : node.ownerDocument.defaultView.innerWidth;
???var height = options.height != null ? options.height : node.ownerDocument.defaultView.innerHeight;
???return renderDocument(node.ownerDocument, options, width, height, index).then(function (canvas) {
???????* *
???????if (typeof(options.onrendered) === "function") {
???????????log("options.onrendered is deprecated, html2canvas returns a Promise containing the canvas");
???????????options.onrendered(canvas);
???????}
???????return canvas;
???});
</script>
</body>
</html>
通过按钮截取当前网页成png或jpeg格式的图片并保存
原文地址：http://www.cnblogs.com/johnny-cli/p/8004512.html