利用Javascript生成txt文本文件

标签：event   web   init   apple   object   string   attribute   over   note   

1. <script type="text/javascript">  
2. // 将字符串用txt的格式报存 ie中会出现中文乱码的问题  
3. var saveAs = saveAs || (function(view) {  
4.     "use strict";  
5.     // IE <10 is explicitly unsupported  
6.     if (typeof view === "undefined" || typeof navigator !== "undefined" && /MSIE [1-9]\./.test(navigator.userAgent)) {  
7.         return;  
8.     }  
9.     var  
10.           doc = view.document  
11.           // only get URL when necessary in case Blob.js hasn‘t overridden it yet  
12.         , get_URL = function() {  
13.             return view.URL || view.webkitURL || view;  
14.         }  
15.         , save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a")  
16.         , can_use_save_link = "download" in save_link  
17.         , click = function(node) {  
18.             var event = new MouseEvent("click");  
19.             node.dispatchEvent(event);  
20.         }  
21.         , is_safari = /constructor/i.test(view.HTMLElement) || view.safari  
22.         , is_chrome_ios =/CriOS\/[\d]+/.test(navigator.userAgent)  
23.         , throw_outside = function(ex) {  
24.             (view.setImmediate || view.setTimeout)(function() {  
25.                 throw ex;  
26.             }, 0);  
27.         }  
28.         , force_saveable_type = "application/octet-stream"  
29.         // the Blob API is fundamentally broken as there is no "downloadfinished" event to subscribe to  
30.         , arbitrary_revoke_timeout = 1000 * 40 // in ms  
31.         , revoke = function(file) {  
32.             var revoker = function() {  
33.                 if (typeof file === "string") { // file is an object URL  
34.                     get_URL().revokeObjectURL(file);  
35.                 } else { // file is a File  
36.                     file.remove();  
37.                 }  
38.             };  
39.             setTimeout(revoker, arbitrary_revoke_timeout);  
40.         }  
41.         , dispatch = function(filesaver, event_types, event) {  
42.             event_types = [].concat(event_types);  
43.             var i = event_types.length;  
44.             while (i--) {  
45.                 var listener = filesaver["on" + event_types[i]];  
46.                 if (typeof listener === "function") {  
47.                     try {  
48.                         listener.call(filesaver, event || filesaver);  
49.                     } catch (ex) {  
50.                         throw_outside(ex);  
51.                     }  
52.                 }  
53.             }  
54.         }  
55.         , auto_bom = function(blob) {  
56.             // prepend BOM for UTF-8 XML and text/* types (including HTML)  
57.             // note: your browser will automatically convert UTF-16 U+FEFF to EF BB BF  
58.             if (/^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)) {  
59.                 return new Blob([String.fromCharCode(0xFEFF), blob], {type: blob.type});  
60.             }  
61.             return blob;  
62.         }  
63.         , FileSaver = function(blob, name, no_auto_bom) {  
64.             if (!no_auto_bom) {  
65.                 blob = auto_bom(blob);  
66.             }  
67.             // First try a.download, then web filesystem, then object URLs  
68.             var  
69.                   filesaver = this  
70.                 , type = blob.type  
71.                 , force = type === force_saveable_type  
72.                 , object_url  
73.                 , dispatch_all = function() {  
74.                     dispatch(filesaver, "writestart progress write writeend".split(" "));  
75.                 }  
76.                 // on any filesys errors revert to saving with object URLs  
77.                 , fs_error = function() {  
78.                     if ((is_chrome_ios || (force && is_safari)) && view.FileReader) {  
79.                         // Safari doesn‘t allow downloading of blob urls  
80.                         var reader = new FileReader();  
81.                         reader.onloadend = function() {  
82.                             var url = is_chrome_ios ? reader.result : reader.result.replace(/^data:[^;]*;/, ‘data:attachment/file;‘);  
83.                             var popup = view.open(url, ‘_blank‘);  
84.                             if(!popup) view.location.href = url;  
85.                             url=undefined; // release reference before dispatching  
86.                             filesaver.readyState = filesaver.DONE;  
87.                             dispatch_all();  
88.                         };  
89.                         reader.readAsDataURL(blob);  
90.                         filesaver.readyState = filesaver.INIT;  
91.                         return;  
92.                     }  
93.                     // don‘t create more object URLs than needed  
94.                     if (!object_url) {  
95.                         object_url = get_URL().createObjectURL(blob);  
96.                     }  
97.                     if (force) {  
98.                         view.location.href = object_url;  
99.                     } else {  
100.                         var opened = view.open(object_url, "_blank");  
101.                         if (!opened) {  
102.                             // Apple does not allow window.open, see https://developer.apple.com/library/safari/documentation/Tools/Conceptual/SafariExtensionGuide/WorkingwithWindowsandTabs/WorkingwithWindowsandTabs.html  
103.                             view.location.href = object_url;  
104.                         }  
105.                     }  
106.                     filesaver.readyState = filesaver.DONE;  
107.                     dispatch_all();  
108.                     revoke(object_url);  
109.                 }  
110.             ;  
111.             filesaver.readyState = filesaver.INIT;  
112.   
113.             if (can_use_save_link) {  
114.                 object_url = get_URL().createObjectURL(blob);  
115.                 setTimeout(function() {  
116.                     save_link.href = object_url;  
117.                     save_link.download = name;  
118.                     click(save_link);  
119.                     dispatch_all();  
120.                     revoke(object_url);  
121.                     filesaver.readyState = filesaver.DONE;  
122.                 });  
123.                 return;  
124.             }  
125.   
126.             fs_error();  
127.         }  
128.         , FS_proto = FileSaver.prototype  
129.         , saveAs = function(blob, name, no_auto_bom) {  
130.             return new FileSaver(blob, name || blob.name || "download", no_auto_bom);  
131.         }  
132.     ;  
133.     // IE 10+ (native saveAs)  
134.     if (typeof navigator !== "undefined" && navigator.msSaveOrOpenBlob) {  
135.         return function(blob, name, no_auto_bom) {  
136.             name = name || blob.name || "download";  
137.   
138.             if (!no_auto_bom) {  
139.                 blob = auto_bom(blob);  
140.             }  
141.             return navigator.msSaveOrOpenBlob(blob, name);  
142.         };  
143.     }  
144.   
145.     FS_proto.abort = function(){};  
146.     FS_proto.readyState = FS_proto.INIT = 0;  
147.     FS_proto.WRITING = 1;  
148.     FS_proto.DONE = 2;  
149.   
150.     FS_proto.error =  
151.     FS_proto.onwritestart =  
152.     FS_proto.onprogress =  
153.     FS_proto.onwrite =  
154.     FS_proto.onabort =  
155.     FS_proto.onerror =  
156.     FS_proto.onwriteend =  
157.         null;  
158.   
159.     return saveAs;  
160. }(  
161.        typeof self !== "undefined" && self  
162.     || typeof window !== "undefined" && window  
163.     || this.content  
164. ));  
165. // `self` is undefined in Firefox for Android content script context  
166. // while `this` is nsIContentFrameMessageManager  
167. // with an attribute `content` that corresponds to the window  
168.   
169. if (typeof module !== "undefined" && module.exports) {  
170.   module.exports.saveAs = saveAs;  
171. } else if ((typeof define !== "undefined" && define !== null) && (define.amd !== null)) {  
172.   define("FileSaver.js", function() {  
173.     return saveAs;  
174.   });  
175. }  
176.   
177. // 引入上边的js后，就可以调用生成文本的方法 另外ie下会有中文乱码的问题  
178. var blob = new Blob(["Hello, world!\t\n我是milo，你好啊"], {type: "text/plain;charset=utf-8"});  
179. saveAs(blob, "hello world.txt");  
180. </script>  

http://blog.csdn.net/baidu_34036884/article/details/68070550

利用Javascript生成txt文本文件

标签：event   web   init   apple   object   string   attribute   over   note   

原文地址：http://www.cnblogs.com/jiangcm/p/7944288.html