直接客户端浏览器下载文件，不必通过回传服务器再下载(例如将table内容导出excel)

//value：文件内容，type：文件类型，name：文件名

//(例如将table内容导出excel，可以生成xml格式的xls内容，然后直接调用这函数下载到客户端电脑)

function _ saveFile( value, type, name) {

var blob;

if ( typeof window. Blob == "function") {

blob = new Blob([ value], { type: type});

} else {

var BlobBuilder = window. BlobBuilder || window. MozBlobBuilder || window. WebKitBlobBuilder || window. MSBlobBuilder;

var bb = new BlobBuilder();

bb. append( value);

blob = bb. getBlob( type);

}

var URL = window. URL || window. webkitURL;

var bloburl = URL. createObjectURL( blob);

var anchor = document. createElement( "a");

if ( 'download' in anchor) {

anchor. style. visibility = "hidden";

anchor. href = bloburl;

anchor. download = name;

document. body. appendChild( anchor);

var evt = document. createEvent( "MouseEvents");

evt. initEvent( "click", true, true);

anchor. dispatchEvent( evt);

document. body. removeChild( anchor);

} else if ( navigator. msSaveBlob) {

navigator. msSaveBlob( blob, name);

} else {

location. href = bloburl;

}

}