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file.js
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file.js
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var h = {
init: function() {
var me = this;
if(!me.isSupportFileApi){
console.log('此浏览器不支持H5文件操作api');
return;
}
document.getElementById('File').onchange = me.fileHandler;
document.getElementById('Abort').onclick = me.abortHandler;
me.status = document.getElementById('Status');
me.progress = document.getElementById('Progress');
me.percent = document.getElementById('Percent');
me.onLoadEnd = 0;
//已读取百分比
me.loaded = 0;
//每次读取1M
me.step = 1024 * 1024;
me.times = 0;
//文件列表
me.files = [];
//对应的文件读取FileReader
me.readers = [];
},
fileHandler: function(e) {
var me = h;
var files = me.files = this.files, filesLen = files.length;
// for(i=0;i<filesLen;i++) {
// me.readers[i] = new FileReader();
// me.readers[i].onloadstart = me.onLoadStart;
// me.readers[i].onprogress = me.onProgress;
// me.readers[i].onabort = me.onAbort;
// me.readers[i].onerror = me.onerror;
// me.readers[i].onload = me.onLoad;
// me.readers[i].onloadend = me.onLoadEnd;
// me.readBlob(files[i],i);
// }
//获取到上传的第一个文件
var file = me.file = this.files[0];
var reader = me.reader = new FileReader();
me.total = file.size;
reader.onloadstart = me.onLoadStart;
reader.onprogress = me.onProgress;
reader.onabort = me.onAbort;
reader.onerror = me.onerror;
reader.onload = me.onLoad;
reader.onloadend = me.onLoadEnd;
//读取第一块
me.readBlob(file, 0);
},
onLoadStart: function() {
var me = h;
},
onProgress: function(e) {
console.log(e);
var me = h;
me.loaded += e.loaded;
//更新进度条
if(me.total == 0){
//上传一个空文件时
me.progress.value = 100;
}else{
me.progress.value = (me.loaded / me.total) * 100;
}
},
onAbort: function() {
var me = h;
},
onError: function() {
var me = h;
},
onLoad: function(e) {
e.preventDefault();
e.stopPropagation()
var me = h,
file = me.file,
reader = me.reader,
result = e.target.result; //读取的文件内容
if(me.loaded < me.total) {
result = reader.result; //读取的文件内容
console.log(result);
me.readBlob(me.loaded); //读取文件
} else {
me.loaded = me.total;
}
switch (me.getFileType(me.file.type)){
case 'IMG':
document.getElementById('preview').setAttribute('src', me.BlobToDataUrl(file));
break;
default:
document.getElementById('fileContent').innerHTML = result;
break;
}
console.log(result);
},
onLoadEnd: function() {
var me = h;
},
readBlob: function(start) {
var me = h;
var blob,
file = me.file;
me.times += 1;
console.log(file);
//在这里根据文件类型选择文件读取方式
var ftype = me.getFileType(file.type);
console.log(ftype);
switch (ftype){
case 'IMG':
var datauri = me.reader.readAsDataURL(file);
break;
default:
var string = me.reader.readAsText(file);
break;
}
},
abortHandler: function() {
var me = h;
if(me.reader) {
me.reader.abort();
}
},
isSupportFileApi: function () {
/**
* 判断是否支持文件操作api
*/
if(window.File && window.FileList && window.FileReader && window.Blob) {
return true;
}
return false;
},
getFileType: function(type){
/**
* 根据文件的MIME判断文件的类型
* @返回值:
* 'IMG': 图片类型
* 'CVS'
*/
var Reg = {
img: /image\/(jpeg|png|jpg|ico|jpe|gif|bmp)/,
exe: /application\/x-msdownload/,
zip: /application\/x-zip-compressed/,
txt: /text\/plain/,
pdf: /application\/pdf/,
doc: /application\/msword/,
excel: /application\/vnd.ms-excel/,
ppt: /application\/vnd.ms-ppt/,
flash: /application\/x-shockwave-flash/,
};
if(Reg.img.test(type)){
return 'IMG';
}else if(Reg.exe.test(type)){
return 'EXE';
}else if(Reg.zip.test(type)){
return 'ZIP';
}else if(Reg.txt.test(type)){
return 'TXT';
}else if(Reg.pdf.test(type)){
return 'PDF';
}else if(Reg.doc.test(type)){
return 'DOC';
}else if(Reg.excel.test(type)){
return 'EXECL';
}else if(Reg.ppt.test(type)){
return 'PPT';
}else if(Reg.flash.test(type)){
return 'FLASH';
}else{
return 'OTHER';
}
},
dataUrlToBlob: function(dataurl){
/**
* dataurl转blob对象
* @dataurl: 格式为dataurl的字符串
*/
var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
while(n--){
u8arr[n] = bstr.charCodeAt(n);
}
return new Blob([u8arr], {type:mime});
},
BlobToDataUrl: function(blob){
/**
* blob或者file对象转成Url
* @blob file或者blob对象
*/
return window.URL.createObjectURL(blob);
}
};
h.init();