js实现导入导出功能实例代码(FileSave.js)
作者：程序媛zcx
这篇文章主要给大家介绍了关于js实现导入导出功能(FileSave.js)的相关资料,FileSaver.js是在客户端保存文件的解决方案,非常适合在客户端上生成文件的Web应用,需要的朋友可以参考下
点击导出按钮弹出文件框导出文件，点击导入选择文件获取文件数据，以下我保存的是json。
html：
<div class="layui-inline">
<div class="layui-btn-group">
<button type="button" class="layui-btn layui-btn-normal layui-btn-sm" onclick="exportEditFile()">导入</button>
<input type="file" id="importEditFile" accept=".json" onchange="uploadEditFile(this)" style="width:0;visibility:hidden;opacity: 0">
<button type="button" class="layui-btn layui-btn-normal layui-btn-sm" onclick="importEditFile()">导出</button>
</div>
</div>
//需要引用 FileSaver.jsjs：
function SceneFileSaveAs(obj, name) {
let content = JSON.stringify(obj, null, 4);
let blob = new Blob([content], { type: "text/plain;charset=utf-8" });
saveAs(blob, name);
}
//导出文件
function exportEditFile() {
//文件的json数据
let testobj = {
"id": 1,
"name": "11"
};
//保存的文件名
let fileName = "file_" + localStorage.getItem("ip") + ".json";
SceneFileSaveAs(testobj, fileName);
}
//导入文件
function importEditFile() {
$("#importEditFile").click();
}
// 导入
function uploadEditFile(input) {
//支持chrome IE10
let file = input.files[0];//获取读取的File对象
let filepath = file.name;//读取选中文件的文件名
let filename = file.name.split(".")[0];
let size = file.size;//读取选中文件的大小
console.log("文件名:" + filepath + "大小：" + size);
if (window.FileReader) {
console.log("window.FileReader")
var reader = new FileReader();
console.log(" reader.onload");
reader.readAsText(file);//读取文件的内容
reader.onload = function () {
console.log(" reader.onload----------------")
let myresult = this.result;//当读取完成之后会回调这个函数，然后此时文件的内容存储到了result中。直接操作即可。
input.value = "";
if(isJSON(myresult)){
let myresult1 = JSON.parse(myresult);
console.log(myresult1);
SceneEditSend(myresult1);
}else {
console.log("文件内容格式异常");
}
}
// reader.readAsText(file);
}
}
//拿到json文件里的数据
function SceneEditSend(data) {
console.log(data.name);
}FileSaver.js 框架代码：
/* FileSaver.js
* A saveAs() FileSaver implementation.
* 2014-11-29
*
* By Eli Grey, http://eligrey.com
* License: X11/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
// IE 10+ (native saveAs)
|| (typeof navigator !== "undefined" &&
navigator.msSaveOrOpenBlob && navigator.msSaveOrOpenBlob.bind(navigator))
// Everyone else
|| (function(view) {
"use strict";
// IE <10 is explicitly unsupported
if (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 = doc.createEvent("MouseEvents");
event.initMouseEvent(
"click", true, false, view, 0, 0, 0, 0, 0
, false, false, false, false, 0, null
);
node.dispatchEvent(event);
}
, webkit_req_fs = view.webkitRequestFileSystem
, req_fs = view.requestFileSystem || webkit_req_fs || view.mozRequestFileSystem
, throw_outside = function(ex) {
(view.setImmediate || view.setTimeout)(function() {
throw ex;
}, 0);
}
, force_saveable_type = "application/octet-stream"
, fs_min_size = 0
// See https://code.google.com/p/chromium/issues/detail?id=375297#c7 and
// https://github.com/eligrey/FileSaver.js/commit/485930a#commitcomment-8768047
// for the reasoning behind the timeout and revocation flow
, arbitrary_revoke_timeout = 500 // 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();
}
};
if (view.chrome) {
revoker();
} else {
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);
}
}
}
}
, FileSaver = function(blob, name) {
// First try a.download, then web filesystem, then object URLs
var
filesaver = this
, type = blob.type
, blob_changed = false
, object_url
, target_view
, dispatch_all = function() {
dispatch(filesaver, "writestart progress write writeend".split(" "));
}
// on any filesys errors revert to saving with object URLs
, fs_error = function() {
// don't create more object URLs than needed
if (blob_changed || !object_url) {
object_url = get_URL().createObjectURL(blob);
}
if (target_view) {
target_view.location.href = object_url;
} else {
var new_tab = view.open(object_url, "_blank");
if (new_tab == undefined && typeof safari !== "undefined") {
//Apple do not allow window.open, see http://bit.ly/1kZffRI
view.location.href = object_url
}
}
filesaver.readyState = filesaver.DONE;
dispatch_all();
revoke(object_url);
}
, abortable = function(func) {
return function() {
if (filesaver.readyState !== filesaver.DONE) {
return func.apply(this, arguments);
}
};
}
, create_if_not_found = {create: true, exclusive: false}
, slice
;
filesaver.readyState = filesaver.INIT;
if (!name) {
name = "download";
}
if (can_use_save_link) {
object_url = get_URL().createObjectURL(blob);
save_link.href = object_url;
save_link.download = name;
click(save_link);
filesaver.readyState = filesaver.DONE;
dispatch_all();
revoke(object_url);
return;
}
// Object and web filesystem URLs have a problem saving in Google Chrome when
// viewed in a tab, so I force save with application/octet-stream
// http://code.google.com/p/chromium/issues/detail?id=91158
// Update: Google errantly closed 91158, I submitted it again:
// https://code.google.com/p/chromium/issues/detail?id=389642
if (view.chrome && type && type !== force_saveable_type) {
slice = blob.slice || blob.webkitSlice;
blob = slice.call(blob, 0, blob.size, force_saveable_type);
blob_changed = true;
}
// Since I can't be sure that the guessed media type will trigger a download
// in WebKit, I append .download to the filename.
// https://bugs.webkit.org/show_bug.cgi?id=65440
if (webkit_req_fs && name !== "download") {
name += ".download";
}
if (type === force_saveable_type || webkit_req_fs) {
target_view = view;
}
if (!req_fs) {
fs_error();
return;
}
fs_min_size += blob.size;
req_fs(view.TEMPORARY, fs_min_size, abortable(function(fs) {
fs.root.getDirectory("saved", create_if_not_found, abortable(function(dir) {
var save = function() {
dir.getFile(name, create_if_not_found, abortable(function(file) {
file.createWriter(abortable(function(writer) {
writer.onwriteend = function(event) {
target_view.location.href = file.toURL();
filesaver.readyState = filesaver.DONE;
dispatch(filesaver, "writeend", event);
revoke(file);
};
writer.onerror = function() {
var error = writer.error;
if (error.code !== error.ABORT_ERR) {
fs_error();
}
};
"writestart progress write abort".split(" ").forEach(function(event) {
writer["on" + event] = filesaver["on" + event];
});
writer.write(blob);
filesaver.abort = function() {
writer.abort();
filesaver.readyState = filesaver.DONE;
};
filesaver.readyState = filesaver.WRITING;
}), fs_error);
}), fs_error);
};
dir.getFile(name, {create: false}, abortable(function(file) {
// delete file if it already exists
file.remove();
save();
}), abortable(function(ex) {
if (ex.code === ex.NOT_FOUND_ERR) {
save();
} else {
fs_error();
}
}));
}), fs_error);
}), fs_error);
}
, FS_proto = FileSaver.prototype
, saveAs = function(blob, name) {
return new FileSaver(blob, name);
}
;
FS_proto.abort = function() {
var filesaver = this;
filesaver.readyState = filesaver.DONE;
dispatch(filesaver, "abort");
};
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 !== null) {
module.exports = saveAs;
} else if ((typeof define !== "undefined" && define !== null) && (define.amd != null)) {
define([], function() {
return saveAs;
});
}总结
到此这篇关于js实现导入导出功能(FileSave.js)的文章就介绍到这了,更多相关js导入导出FileSave.js内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！