包含本地图片请点击word转存怎么解决_为什么会出现跨域问题

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1.描述

想必很多人在开发项目的时候都遇到过这种需求，就是将一个html一键转成word，然后发现无论如何都没法将界面中的图片给保存下来，其实这是因为图片存在跨域的问题，目前我的解决办法是自己的图片保存在 七牛云 中，就不会出现这个问题了。如何你存储到其他的地方，比如自己的服务器，可能就需要开放自己的跨域(自行解决)，如果你的图片是外部连接，比如csdn，这样是没法保存的，csdn上的图片不支持跨域请求。

2.Js代码

2.1.启动Js

function downloadword() { 
   
    $("#paperque").wordExport(papername);  //fileName为导出的word文件的命名
    html2canvas(document.getElementById("paperque"), { 
   
        onrendered: function (canvas) { 
   
            //通过html2canvas将html渲染成canvas，然后获取图片数据
            var imgData = canvas.toDataURL('image/jpeg');
            //初始化pdf，设置相应格式
            var doc = new jsPDF("p", "mm", "a4");
            doc.setFillColor(0, 0, 0);
            //这里设置的是a4纸张尺寸
            doc.addImage(imgData, 'JPEG', 0, 0, 210, 297);
            //输出保存命名为content的pdf
            doc.save(papername + '.word');
        }
    });
}

2.2.wordexport.js

主要是下面这行代码

relimg.setAttribute("crossOrigin",'Anonymous');

if (typeof jQuery !== "undefined" && typeof saveAs !== "undefined") { 

(function($) { 

$.fn.wordExport = function(fileName) { 

fileName = typeof fileName !== 'undefined' ? fileName : "jQuery-Word-Export";
var static = { 

mhtml: { 

top: "Mime-Version: 1.0\nContent-Base: " + location.href + "\nContent-Type: Multipart/related; boundary=\"NEXT.ITEM-BOUNDARY\";type=\"text/html\"\n\n--NEXT.ITEM-BOUNDARY\nContent-Type: text/html; charset=\"utf-8\"\nContent-Location: " + location.href + "\n\n<!DOCTYPE html>\n<html>\n_html_</html>",
head: "<head>\n<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">\n<style>\n_styles_\n</style>\n</head>\n",
body: "<body>_body_</body>"
}
};
var options = { 

maxWidth: 624
};
// Clone selected element before manipulating it
var markup = $(this).clone();
// Remove hidden elements from the output
markup.each(function() { 

var self = $(this);
if (self.is(':hidden'))
self.remove();
});
// Embed all images using Data URLs
var images = Array();
var img = markup.find('img');
for (var i = 0; i < img.length; i++) { 

// Calculate dimensions of output image
var w = Math.min(img[i].width, options.maxWidth);
var h = img[i].height * (w / img[i].width);
// Create canvas for converting image to data URL
var canvas = document.createElement("CANVAS");
canvas.width = w;
canvas.height = h;
// Draw image to canvas
var context = canvas.getContext('2d'),
relimg = new Image(),//创建新的图片对象
base64 = '' ;//base64
relimg.src = img[i].src;
relimg.setAttribute("crossOrigin",'Anonymous'); //设置图片的跨域属性
relimg.onload = function(){ 
//图片加载完，再draw 和 toDataURL
context.drawImage(relimg,0, 0, w, h);
base64 = canvas.toDataURL("image/png");
};
// Get data URL encoding of image
var uri = canvas.toDataURL("image/png");
$(img[i]).attr("src", img[i].src);
img[i].width = w;
img[i].height = h;
// Save encoded image to array
images[i] = { 

type: uri.substring(uri.indexOf(":") + 1, uri.indexOf(";")),
encoding: uri.substring(uri.indexOf(";") + 1, uri.indexOf(",")),
location: $(img[i]).attr("src"),
data: uri.substring(uri.indexOf(",") + 1)
};
}
// Prepare bottom of mhtml file with image data
var mhtmlBottom = "\n";
for (var i = 0; i < images.length; i++) { 

mhtmlBottom += "--NEXT.ITEM-BOUNDARY\n";
mhtmlBottom += "Content-Location: " + images[i].location + "\n";
mhtmlBottom += "Content-Type: " + images[i].type + "\n";
mhtmlBottom += "Content-Transfer-Encoding: " + images[i].encoding + "\n\n";
mhtmlBottom += images[i].data + "\n\n";
}
mhtmlBottom += "--NEXT.ITEM-BOUNDARY--";
//TODO: load css from included stylesheet
var styles = "";
// Aggregate parts of the file together
var fileContent = static.mhtml.top.replace("_html_", static.mhtml.head.replace("_styles_", styles) + static.mhtml.body.replace("_body_", markup.html())) + mhtmlBottom;
// Create a Blob with the file contents
var blob = new Blob([fileContent], { 

type: "application/msword;charset=utf-8"
});
saveAs(blob, fileName + ".doc");
};
})(jQuery);
} else { 

if (typeof jQuery === "undefined") { 

console.error("jQuery Word Export: missing dependency (jQuery)");
}
if (typeof saveAs === "undefined") { 

console.error("jQuery Word Export: missing dependency (FileSaver.js)");
}
}

2.2.fileSavers.js

/* FileSaver.js * A saveAs() FileSaver implementation. * 1.3.2 * 2016-06-16 18:25:19 * * By Eli Grey, http://eligrey.com * License: MIT * See https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md */
/*global self */
/*jslint bitwise: true, indent: 4, laxbreak: true, laxcomma: true, smarttabs: true, plusplus: true */
/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */
var saveAs = saveAs || (function(view) { 

"use strict";
// IE <10 is explicitly unsupported
if (typeof view === "undefined" || typeof navigator !== "undefined" && /MSIE [1-9]\./.test(navigator.userAgent)) { 

return;
}
var
doc = view.document
// only get URL when necessary in case Blob.js hasn't overridden it yet
, get_URL = function() { 

return view.URL || view.webkitURL || view;
}
, save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a")
, can_use_save_link = "download" in save_link
, click = function(node) { 

var event = new MouseEvent("click");
node.dispatchEvent(event);
}
, is_safari = /constructor/i.test(view.HTMLElement)
, is_chrome_ios =/CriOS\/[\d]+/.test(navigator.userAgent)
, throw_outside = function(ex) { 

(view.setImmediate || view.setTimeout)(function() { 

throw ex;
}, 0);
}
, force_saveable_type = "application/octet-stream"
// the Blob API is fundamentally broken as there is no "downloadfinished" event to subscribe to
, arbitrary_revoke_timeout = 1000 * 40 // in ms
, revoke = function(file) { 

var revoker = function() { 

if (typeof file === "string") { 
 // file is an object URL
get_URL().revokeObjectURL(file);
} else { 
 // file is a File
file.remove();
}
};
setTimeout(revoker, arbitrary_revoke_timeout);
}
, dispatch = function(filesaver, event_types, event) { 

event_types = [].concat(event_types);
var i = event_types.length;
while (i--) { 

var listener = filesaver["on" + event_types[i]];
if (typeof listener === "function") { 

try { 

listener.call(filesaver, event || filesaver);
} catch (ex) { 

throw_outside(ex);
}
}
}
}
, auto_bom = function(blob) { 

// prepend BOM for UTF-8 XML and text/* types (including HTML)
// note: your browser will automatically convert UTF-16 U+FEFF to EF BB BF
if (/^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)) { 

return new Blob([String.fromCharCode(0xFEFF), blob], { 
type: blob.type});
}
return blob;
}
, FileSaver = function(blob, name, no_auto_bom) { 

if (!no_auto_bom) { 

blob = auto_bom(blob);
}
// First try a.download, then web filesystem, then object URLs
var
filesaver = this
, type = blob.type
, force = type === force_saveable_type
, object_url
, dispatch_all = function() { 

dispatch(filesaver, "writestart progress write writeend".split(" "));
}
// on any filesys errors revert to saving with object URLs
, fs_error = function() { 

if ((is_chrome_ios || (force && is_safari)) && view.FileReader) { 

// Safari doesn't allow downloading of blob urls
var reader = new FileReader();
reader.onloadend = function() { 

var url = is_chrome_ios ? reader.result : reader.result.replace(/^data:[^;]*;/, 'data:attachment/file;');
var popup = view.open(url, '_blank');
if(!popup) view.location.href = url;
url=undefined; // release reference before dispatching
filesaver.readyState = filesaver.DONE;
dispatch_all();
};
reader.readAsDataURL(blob);
filesaver.readyState = filesaver.INIT;
return;
}
// don't create more object URLs than needed
if (!object_url) { 

object_url = get_URL().createObjectURL(blob);
}
if (force) { 

view.location.href = object_url;
} else { 

var opened = view.open(object_url, "_blank");
if (!opened) { 

// Apple does not allow window.open, see https://developer.apple.com/library/safari/documentation/Tools/Conceptual/SafariExtensionGuide/WorkingwithWindowsandTabs/WorkingwithWindowsandTabs.html
view.location.href = object_url;
}
}
filesaver.readyState = filesaver.DONE;
dispatch_all();
revoke(object_url);
}
;
filesaver.readyState = filesaver.INIT;
if (can_use_save_link) { 

object_url = get_URL().createObjectURL(blob);
setTimeout(function() { 

save_link.href = object_url;
save_link.download = name;
click(save_link);
dispatch_all();
revoke(object_url);
filesaver.readyState = filesaver.DONE;
});
return;
}
fs_error();
}
, FS_proto = FileSaver.prototype
, saveAs = function(blob, name, no_auto_bom) { 

return new FileSaver(blob, name || blob.name || "download", no_auto_bom);
}
;
// IE 10+ (native saveAs)
if (typeof navigator !== "undefined" && navigator.msSaveOrOpenBlob) { 

return function(blob, name, no_auto_bom) { 

name = name || blob.name || "download";
if (!no_auto_bom) { 

blob = auto_bom(blob);
}
return navigator.msSaveOrOpenBlob(blob, name);
};
}
FS_proto.abort = function(){ 
};
FS_proto.readyState = FS_proto.INIT = 0;
FS_proto.WRITING = 1;
FS_proto.DONE = 2;
FS_proto.error =
FS_proto.onwritestart =
FS_proto.onprogress =
FS_proto.onwrite =
FS_proto.onabort =
FS_proto.onerror =
FS_proto.onwriteend =
null;
return saveAs;
}(
typeof self !== "undefined" && self
|| typeof window !== "undefined" && window
|| this.content
));
// `self` is undefined in Firefox for Android content script context
// while `this` is nsIContentFrameMessageManager
// with an attribute `content` that corresponds to the window
if (typeof module !== "undefined" && module.exports) { 

module.exports.saveAs = saveAs;
} else if ((typeof define !== "undefined" && define !== null) && (define.amd !== null)) { 

define([], function() { 

return saveAs;
});
}

3.使用

引入上面的js，网页中一个按钮，点击这个按钮调用downloadword函数即可，其中文件导出的文件名字可以自定义。

4.视图问题

上面运行后发现文档打开的页面不是 页面视图 ，而是 web视图 ，其实还需要修改wordexport.js。其中var static = {} 修改成如下内容。

var static = { 

mhtml: { 

top: "Mime-Version: 1.0\nContent-Base: " + location.href + "\nContent-Type: Multipart/related; boundary=\"NEXT.ITEM-BOUNDARY\";type=\"text/html\"\n\n--NEXT.ITEM-BOUNDARY\nContent-Type: text/html; charset=\"utf-8\"\nContent-Location: " + location.href + "\n\n<!DOCTYPE html>\n" +
"<html xmlns:v=\"urn:schemas-microsoft-com:vml\" xmlns:o=\"urn:schemas-microsoft-com:office:office\" xmlns:w=\"urn:schemas-microsoft-com:office:word\" xmlns:m=\"http://schemas.microsoft.com/office/2004/12/omml\" xmlns=\"http://www.w3.org/TR/REC-html40\">\n_html_</html>",
head: "<head>\n<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">\n<style>\n_styles_\n</style>\n<!--[if gte mso 9]><xml><w:WordDocument><w:View>Print</w:View><w:TrackMoves>false</w:TrackMoves><w:TrackFormatting/><w:ValidateAgainstSchemas/><w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid><w:IgnoreMixedContent>false</w:IgnoreMixedContent><w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText><w:DoNotPromoteQF/><w:LidThemeOther>EN-US</w:LidThemeOther><w:LidThemeAsian>ZH-CN</w:LidThemeAsian><w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript><w:Compatibility><w:BreakWrappedTables/><w:SnapToGridInCell/><w:WrapTextWithPunct/><w:UseAsianBreakRules/><w:DontGrowAutofit/><w:SplitPgBreakAndParaMark/><w:DontVertAlignCellWithSp/><w:DontBreakConstrainedForcedTables/><w:DontVertAlignInTxbx/><w:Word11KerningPairs/><w:CachedColBalance/><w:UseFELayout/></w:Compatibility><w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel><m:mathPr><m:mathFont m:val=\"Cambria Math\"/><m:brkBin m:val=\"before\"/><m:brkBinSub m:val=\"--\"/><m:smallFrac m:val=\"off\"/><m:dispDef/><m:lMargin m:val=\"0\"/> <m:rMargin m:val=\"0\"/><m:defJc m:val=\"centerGroup\"/><m:wrapIndent m:val=\"1440\"/><m:intLim m:val=\"subSup\"/><m:naryLim m:val=\"undOvr\"/></m:mathPr></w:WordDocument></xml><![endif]--></head>\n",
body: "<body>_body_</body>"
}
};

其实就是在html之间加入：

<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml"
xmlns="http://www.w3.org/TR/REC-html40">

在head中加入：

<!--[if gte mso 9]><xml><w:WordDocument><w:View>Print</w:View><w:TrackMoves>false</w:TrackMoves><w:TrackFormatting/><w:ValidateAgainstSchemas/><w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid><w:IgnoreMixedContent>false</w:IgnoreMixedContent><w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText><w:DoNotPromoteQF/><w:LidThemeOther>EN-US</w:LidThemeOther><w:LidThemeAsian>ZH-CN</w:LidThemeAsian><w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript><w:Compatibility><w:BreakWrappedTables/><w:SnapToGridInCell/><w:WrapTextWithPunct/><w:UseAsianBreakRules/><w:DontGrowAutofit/><w:SplitPgBreakAndParaMark/><w:DontVertAlignCellWithSp/><w:DontBreakConstrainedForcedTables/><w:DontVertAlignInTxbx/><w:Word11KerningPairs/><w:CachedColBalance/><w:UseFELayout/></w:Compatibility><w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel><m:mathPr><m:mathFont m:val="Cambria Math"/><m:brkBin m:val="before"/><m:brkBinSub m:val="--"/><m:smallFrac m:val="off"/><m:dispDef/><m:lMargin m:val="0"/> <m:rMargin m:val="0"/><m:defJc m:val="centerGroup"/><m:wrapIndent m:val="1440"/><m:intLim m:val="subSup"/><m:naryLim m:val="undOvr"/></m:mathPr></w:WordDocument></xml><![endif]-->