html2canvas

---

作用

• html2canvas可以通过纯JS对浏览器端经行截屏，但截图的精确度还有待提高，部分css不可识别，所以在canvas中不能完美呈现原画面样式

---

支持的浏览器

• Firefox 3.5+
• Google Chrome
• Opera 12+
• IE9+
• Safari 6+

---

基本语法

 //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);});

---

可用参数

参数名称	类型	默认值	描述
allowTaint	boolean	false	Whether to allow cross-origin images to taint the canvas---允许跨域
background	string	#fff	Canvas 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
height	number	null	Define the heigt of the canvas in pixels. If null, renders with full height of the window.---canvas高度设定
letterRendering	boolean	false	Whether to render each letter seperately. Necessary if letter-spacing is used.---在设置了字间距的时候有用
logging	boolean	false	Whether to log events in the console.---在console.log()中输出信息
proxy	string	undefined	Url 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
taintTest	boolean	true	Whether to test each image if it taints the canvas before drawing them---是否在渲染前测试图片
timeout	number	0	Timeout 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
width	number	null	Define the width of the canvas in pixels. If null, renders with full width of the window.---canvas宽度
useCORS	boolean	false	Whether 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

效果图

Paste_Image.png

---

• 截图后

Paste_Image.png

---

html2canvas官网

• 官网
• Github