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async ：Whether to parse and render the element asynchronously
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allowTaint ：Whether to allow cross-origin images to taint the canvas
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useCORS ：Whether to attempt to load images from a server using CORS
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canvas：Existing  canvas element to use as a base for drawing on
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foreignObjectRendering：Whether to use ForeignObject rendering if the browser supports it
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imageTimeout：Timeout for loading an image (in milliseconds). Set to  0 to disable timeout
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ignoreElements：Predicate function which removes the matching elements from the render
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logging：Enable logging for debug purposes
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onclone：Callback function which is called when the Document has been cloned for rendering, can be used to modify the contents that will be rendered without affecting the original source document
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proxy：Url to the proxy which is to be used for loading cross-origin images. If left empty, cross-origin images won't be loaded
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removeContainer：Whether to cleanup the cloned DOM elements html2canvas creates temporarily
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scale：The scale to use for rendering. Defaults to the browsers device pixel ratio
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width：The width of the  canvas
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x：Crop canvas x-coordinate
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scrollX：The x-scroll position to used when rendering element, (for example if the Element uses  position: fixed )
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windowWidth：Window width to use when rendering  Element , which may affect things like Media queries
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async:是否异步解析和呈现的元素

allowTaint:是否允许跨源图像到画布上的污点

useCORS:尝试从服务器加载图像使用歌珥

canvas:现有的画布元素使用作为借鉴的基础

foreignObjectRendering:是否使用ForeignObject呈现如果浏览器支持它

imageTimeout:超时(以毫秒为单位)。设置为0以禁用超时

ignoreElements:谓词函数删除匹配元素的呈现

logging:启用日志用于调试目的

onclone:回调函数叫做文档时已经克隆了渲染,可以用来修改的内容呈现在不影响原来的源文档

proxy:Url的代理用于加载跨源图像。如果留空，则不会加载跨源图像

removeContainer:是否清理克隆的DOM元素暂时html2canvas创建

scale:用于规模呈现。默认为浏览器设备像素比

width:画布的宽度

x:作物画布坐标

scrollX:x-scroll位置时使用渲染元素(例如如果元素使用位置:固定)

windowWidth:窗口宽度渲染元素时使用,可能会影响诸如媒体查询