html2canvas.js 要改2处代码
第1处代码 line 603
window.html2canvas = function(nodeList, options) {
var index = html2canvasCloneIndex++;
options = options || {};
if (options.logging) {
window.html2canvas.logging = true;
window.html2canvas.start = Date.now();
}
options.async = typeof(options.async) === "undefined" ? true : options.async;
options.allowTaint = typeof(options.allowTaint) === "undefined" ? false : options.allowTaint;
options.removeContainer = typeof(options.removeContainer) === "undefined" ? true : options.removeContainer;
options.javascriptEnabled = typeof(options.javascriptEnabled) === "undefined" ? false : options.javascriptEnabled;
options.p_w_picpathTimeout = typeof(options.p_w_picpathTimeout) === "undefined" ? 10000 : options.p_w_picpathTimeout;
options.renderer = typeof(options.renderer) === "function" ? options.renderer : CanvasRenderer;
options.strict = !!options.strict;
if (typeof(nodeList) === "string") {
if (typeof(options.proxy) !== "string") {
return Promise.reject("Proxy must be used when rendering url");
}
var width = options.width != null ? options.width : window.innerWidth;
var height = options.height != null ? options.height : window.innerHeight;
return loadUrlDocument(absoluteUrl(nodeList), options.proxy, document, width, height, options).then(function(container) {
return renderWindow(container.contentWindow.document.documentElement, container, options, width, height);
});
}
var node = ((nodeList === undefined) ? [document.documentElement] : ((nodeList.length) ? nodeList : [nodeList]))[0];
node.setAttribute(html2canvasNodeAttribute + index, index);
//return renderDocument(node.ownerDocument, options, node.ownerDocument.defaultView.innerWidth, node.ownerDocument.defaultView.innerHeight, index).then(function(canvas) {
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;
});
};第2处 line 633
function renderWindow(node, container, options, windowWidth, windowHeight) {
var clonedWindow = container.contentWindow;
var support = new Support(clonedWindow.document);
var p_w_picpathLoader = new ImageLoader(options, support);
var bounds = getBounds(node);
var width = options.type === "view" ? windowWidth : documentWidth(clonedWindow.document);
var height = options.type === "view" ? windowHeight : documentHeight(clonedWindow.document);
var renderer = new options.renderer(width, height, p_w_picpathLoader, options, document);
var parser = new NodeParser(node, renderer, support, p_w_picpathLoader, options);
return parser.ready.then(function() {
log("Finished rendering");
var canvas;
if (options.type === "view") {
canvas = crop(renderer.canvas, {width: renderer.canvas.width, height: renderer.canvas.height, top: 0, left: 0, x: 0, y: 0});
} else if (node === clonedWindow.document.body || node === clonedWindow.document.documentElement) {// xiaomin modify
canvas = renderer.canvas;
} else if(options.scale){// xiaominzh modify
var scale = options.scale || 1;
canvas = crop(renderer.canvas, {width: bounds.width * scale, height:bounds.height * scale, top: bounds.top *scale, left: bounds.left *scale, x: 0, y: 0});
}else {
canvas = crop(renderer.canvas, {width: options.width != null ? options.width : bounds.width, height: options.height != null ? options.height : bounds.height, top: bounds.top, left: bounds.left, x: clonedWindow.pageXOffset, y: clonedWindow.pageYOffset});
}
cleanupContainer(container, options);
return canvas;
});
}如何使用
var shareContent = $("#share-person-report")[0]; //需要截图的包裹的DOM 元素
var width = shareContent.offsetWidth; //获取dom 宽度
var height = shareContent.offsetHeight; //获取dom 高度
var canvas = document.createElement("canvas"); //创建一个canvas节点
var scale = 2; //定义任意放大倍数 支持小数
canvas.width = width * scale; //定义canvas 宽度 * 缩放
canvas.height = height * scale; //定义canvas高度 *缩放
canvas.getContext("2d").scale(scale,scale); //获取context,设置scale
html2canvas($('#share-person-report'), {
allowTaint:true,
taintTest:false,
useCORS:true,
background : '#fff',
scale:scale,
width:width,
height:height,
canvas:canvas,
onrendered: function(cav) {
var src = cav.toDataURL();
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