几个进行文件操作的js方法

handleFile.js

//判断文件类型
function checkFileType(file) {
    allowedDocTypes = ["application/pdf", "application/msword", "application/vnd.openxmlformats-officedocument.wordprocessingml.document", "application/vnd.ms-excel", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"];
    if (file.type.indexOf("image/") == 0) {
        return "image"
    } else if (allowedDocTypes.indexOf(file.type) > -1) {
        return "doc"
    }
    return false
}