HTML 代码：
<input type="file" multiple={true} id="file" onChange={this.addFile.bind(this)} accept="application/pdf,application/msword,application/vnd.openxmlformats-officedocument.wordprocessingml.document,.ppt, .pptx"/>
React 代码 - 附加文件并将文件设置为状态：
@autobind
private addFile(event) {
for(var j=0;j<event.target.files.length;j++){
var _size = event.target.files[j].size;
var fSExt = new Array('Bytes', 'KB', 'MB', 'GB'),
i=0;while(_size>900){_size/=1024;i++;}
var exactSize = (Math.round(_size*100)/100)+' '+fSExt[i];
var date = event.target.files[0].lastModifiedDate,
mnth = ("0" + (date.getMonth() + 1)).slice(-2),
day = ("0" + date.getDate()).slice(-2);
date=[day,mnth,date.getFullYear()].join("/");
fileinformation.push({
"file_name": event.target.files[j].name,
"file_size": exactSize,
"file_modified_date":date
});
var ext = event.target.files[j].name.split('.').pop();
if(ext=="pdf" || ext=="docx" || ext=="doc"|| ext=="ppt"|| ext=="pptx"){
} else{
iscorrectfileattached=false;
}
}
if(iscorrectfileattached==false){
alert("Only PFD, Word and PPT file can be attached.");
return false;
}
this.setState({fileinformation});
//new code end
var date = event.target.files[0].lastModifiedDate,
mnth = ("0" + (date.getMonth() + 1)).slice(-2),
day = ("0" + date.getDate()).slice(-2);
date=[day,mnth,date.getFullYear()].join("/");
this.setState({filesize:exactSize});
this.setState({filedate:date});
//let resultFile = document.getElementById('file');
let resultFile = event.target.files;
console.log(resultFile);
let fileInfos = [];
for (var i = 0; i < resultFile.length; i++) {
var fileName = resultFile[i].name;
console.log(fileName);
var file = resultFile[i];
var reader = new FileReader();
reader.onload = (function(file) {
return function(e) {
//Push the converted file into array
fileInfos.push({
"name": file.name,
"content": e.target.result
});
};
})(file);
reader.readAsArrayBuffer(file);
}
this.setState({fileInfos});
this.setState({FileNameValue: event.target.files[0].name });
//this.setState({IsDisabled: true });//for multiple file
console.log(fileInfos);
}