upload_sdk/index.js

import {get_filemd5sum, getBase64} from './utils.js'

function FileUpLoadSdk () {

  const BYTES_PER_CHUNK = 1024 * 1024; // 每个文件切片大小定为1MB
  let offset = 0; //用于断点续传，默认为 0

  const IMAGE_TYPE_ERROR_CODE = 10

  const IMAGE_MULTIPART = '/multipart/upload/'
  const VIDOE_UPLOAD = '/upload/'

  postImage = (host, origin) => {

    if(!/\.(gif|jpg|jpeg|png|GIF|JPG|PNG)$/.test(origin)) {
      return IMAGE_TYPE_ERROR_CODE
    }

    var index1= origin.lastIndexOf(".");
    var index2= origin.length;
    let fileType= origin.substring(index1+1,index2)
    let fileSize = origin.size
    let md5 = get_filemd5sum(origin)
    let chunkNum = Math.ceil(this.fileSize / this.BYTES_PER_CHUNK); // 分片个数
    let base64Body = getBase64(origin)
    let xhr = new XMLHttpRequest()
    xhr.setRequestHeader('LINK_UPLOAD_FILE_SIZE',fileSize)
    xhr.setRequestHeader('LINK_UPLOAD_CHUNK_INDEX',1)
    xhr.setRequestHeader('LINK_UPLOAD_CHUNK_NUM',chunkNum)
    xhr.setRequestHeader('LINK_UPLOAD_CHUNK_SIZE',BYTES_PER_CHUNK)
    xhr.setRequestHeader('LINK_UPLOAD_OFFSET',offset)
    xhr.setRequestHeader('LINK_UPLOAD_FILE_MD5',md5)
    xhr.setRequestHeader('LINK_UPLOAD_FILE_TYPE',fileType)
    xhr.open('post', host+IMAGE_MULTIPART+origin, true)
    xhr.send(base64Body)

    xhr.onreadyStateChange = function () {
      if (xhr.readystate === 4) {
        if (xhr.status === 304 || (xhr.status >= 200 && xhr.status < 300)) {
          console.log('type: success, result: ', xhr.responseText)
        } else {
          console.log('type: error, errCode:', xhr.status)
        }
      }
    }
  }
  
}