点击截图功能 js canvas

使用:html2canvas实现浏览器截图
<html>
    <head>
        <meta name="layout" content="main">
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
        <script type="text/javascript" src="http://html2canvas.hertzen.com/build/html2canvas.js"></script>
        <script type="text/javascript">
            $(document).ready(function() {
                $(".example1").on("click", function(event) {
                    event.preventDefault();
                    html2canvas($(".aa"), {
                     // height: $(".aa").outerHeight() + 20,
                        allowTaint: true,
                        taintTest: false,
                        onrendered: function(canvas) {
                            canvas.id = "mycanvas";
                            //document.body.appendChild(canvas);  
                            //生成base64图片数据  
                            var dataUrl = canvas.toDataURL();
                            var newImg = document.createElement("img");
                            newImg.src = dataUrl;
                            newImg.className = 'img'
                            $(".product").before(newImg);
                        }
                    });
                });
            });
        </script>
    </head>
    <body>
        Hello!
        <div class="aa" style="background-color: #abc;">
            test test test test test test
        </div>
        <textArea id="textArea" col="20" rows="10"></textArea>
        生成界面如下：
        <div class="product">
            <input class="example1" type="button" value="button">
        </div>
    </body>
</html>
参考：http://www.cnblogs.com/yanweidie/p/5203943.html#_label0