知识库

html
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .mask {
      background-color: rgba(0, 0, 0, .7);
    }

    .upload-container {
      position: relative;
      width: 500px;
      height: 100%;
      border: 1px solid #ebebeb;
      margin: 0 auto;
      margin-top: 50px;
      box-shadow: 3px 3px rgba(0, 0, 0, .3);
      padding: 0 30px;
      padding-bottom: 50px;
    }

    .upload-container .upload-mask-tip {
      display: none;
      color: #fff;
      text-align: center;
      position: absolute;
      z-index: 9;
      top: 50%;
      left: 0;
      right: 0;
    }

    .upload-container .upload-img-container {
      width: 150px;
      margin: 0 auto;
      margin-top: 30px;
    }

    .upload-container .upload-img-container .upload-img {
      width: 100%;
      height: 100%;
    }

    .upload-container .upload-tip-container {
      margin-top: 30px;
      text-align: center;
      font-size: 14px;
    }

    .upload-container .upload-tip-container a {
      text-decoration: none;
    }
  </style>
</head>
<body>
  <section class="upload-container">
    <span class="upload-mask-tip">正在上传中, 请稍等...</span>
    <input name="upload-inp" type="file" style="display: none;">
    <div class="upload-img-container">
      <img class="upload-img" src="./static/upload.png" alt="">
    </div>
    <div class="upload-tip-container">
      <span>将图片拖拽到此上传, 或</span>
      <a onclick="uploadByClick()" href="javascript:;">点击此处</a>
      <span>上传</span>
    </div>
  </section>

  <script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.js"></script>
  <script src="https://cdn.bootcdn.net/ajax/libs/qs/6.10.1/qs.js"></script>
  <script src="./request.js"></script>
  <script>
    let uploadContainer = document.querySelector('.upload-container'),
      uploadInp = uploadContainer.querySelector('[name=upload-inp]'),
      uploadMaskTip = uploadContainer.querySelector('.upload-mask-tip'),
      file = null

    async function upload (file) {
      let formData = new FormData
      formData.append('file', file)
      formData.append('filename', file.name)

      // 遮罩层
      uploadContainer.classList.toggle('mask')
      uploadMaskTip.style.display = 'block'

      try {
        let data = await instance.post('/upload-single', formData)

        if (data.status === 0) {
          alert('上传成功')
          return
        }

        throw data.statusText
      } catch (error) {
        alert('上传失败')
      } finally {
        uploadInp.value = ''
        file = null
        uploadContainer.classList.toggle('mask')
        uploadMaskTip.style.display = 'none'
      }
    }

    function uploadByClick () {
      uploadInp.click()
    }

    function uploadByDrag (event) {
      event.preventDefault() // 阻止默认打开新标签页预览图片
      file = event.dataTransfer.files[0] // 获取图片信息
      if (file) {
        upload(file)
      }
    }

    uploadInp.addEventListener('change', function () {
      file = this.files[0]
      if (file) {
        upload(file)
      }
    })

    uploadContainer.addEventListener('dragover', function (event) {
      event.preventDefault() // 阻止默认打开新标签页预览图片
    })

    uploadContainer.addEventListener('drop', uploadByDrag)
  </script>
</body>
</html>