html2canvas.js 能够实现在用户浏览器端直接对整个或部分页面进行截屏。

html2canvas.js可以将当页面渲染成一个Canvas图片，通过读取DOM并将不同的样式应用到这些元素上实现。

它不需要来自服务器任何渲染，整张图片都是在客户端浏览器创建。当

浏览器不支持Canvas时，将采用Flashcanvas或ExplorerCanvas技术代替实现。

以下浏览器能够很好的支持该脚本：Firefox 3.5+, Google Chrome, Opera新的版本, IE9以上的浏览器。

基本语法

html2canvas(element, options);html2canvas(document.body, { onrendered: function(canvas) {  var url = canvas.toDataURL();//图片地址  document.body.appendChild(canvas); }, width: 300, height: 300

或者使用ES6的promise

//两个参数：所需要截图的元素id，截图后要执行的函数， canvas为截图后返回的最后一个canvas html2canvas(document.getElementById('id')).then(function(canvas) {document.body.appendChild(canvas);});

html2canvas基本参数说明

allowTaintbooleanfalseWhether to allow cross-origin images to taint the canvas---允许跨域backgroundstring#fffCanvas background color, if none is specified in DOM. Set undefined for transparent---canvas的背景颜色，如果没有设定默认透明heightnumbernullDefine the heigt of the canvas in pixels. If null, renders with full height of the window.---canvas高度设定letterRenderingbooleanfalseWhether to render each letter seperately. Necessary if letter-spacing is used.---在设置了字间距的时候有用loggingbooleanfalseWhether to log events in the console.---在console.log()中输出信息proxystringundefinedUrl to the proxy which is to be used for loading cross-origin images. If left empty, cross-origin images won't be loaded.---代理地址taintTestbooleantrueWhether to test each image if it taints the canvas before drawing them---是否在渲染前测试图片timeoutnumber0Timeout for loading images, in milliseconds. Setting it to 0 will result in no timeout.---图片加载延迟，默认延迟为0，单位毫秒widthnumbernullDefine the width of the canvas in pixels. If null, renders with full width of the window.---canvas宽度useCORSbooleanfalseWhether to attempt to load cross-origin images as CORS served, before reverting back to proxy--这个我也不知道是干嘛的

例子