主要的知识点是，浏览的paste事件，clipboardData。

paste 一个标准的Dom事件，粘贴事件，会在用户按下Ctrl+v ,或者通过鼠标复制时触发.像其他事件一样，我们可以通过addEventListener为一个Element添加一个粘贴事件的监听函数 如以下代码。

document.addEventListener('paste', (event) => {
  // 阻止默认事件和冒泡行为
  pe.preventDefault()
  pe.stopPropagation()
  // 真正的黏贴事件
  console.log('粘贴事件', event)
});

 

我使用vue3，在页面初始化的时候，就绑定这个监听事件，全局监听页面上的黏贴事件，然后通过读取内容，将文件上传到服务器中，也支持微信截图上传：

// 图片黏贴上传功能
document.addEventListener('paste', (pe) => {
  pe.preventDefault()
  pe.stopPropagation()
  fileList.push(1)
  console.log('粘贴事件---', pe)
  var data = pe.clipboardData!.files[0]
  console.log('fun', data);
  if (!data) {
    return
  }
  var date = new Date()
  var reader = new FileReader();
  var uploadType = getType(data.type, data)
  reader.readAsDataURL(data);
  reader.onload = function (event) {
    console.log("加載成功-", event);
    // 用于预览图片
    var uploadFileRaw = reactive({
      name: data.lastModified + data.name,
      path: uploadType === 'picture' ? event!.target!.result as string : "",
      type: uploadType,
      size: (data.size / 1024 / 1024).toFixed(2).toString() + "M",
      sha: "",
      openLink: '',
      downLink: '',
      htmlLink: '',
      creatTime: `${date.getFullYear()}-${date.getMonth() + 1}-${date.getDate()}`,
      selected: false,
      showTips: false,
      uploading: true,
    })
    gitFileList.push(uploadFileRaw)
    // 用于上传图片
    fileApi.uploadFile(`${filePath.value}/${data.lastModified + data.name}`, {
      "message": "Upload From FileHub",
      "content": (event!.target!.result! as string).split("base64,")[1]
    }).then((res: any) => {
      console.log("上传文件返回:", res);
      if (res.status === 201) {
        uploadFileRaw.uploading = false
        uploadFileRaw.path = res.data.content.path
        uploadFileRaw.sha = res.data.content.sha
        uploadFileRaw.openLink = uploadType === 'picture' ? `${uStore.fileCdn}${res.data.content.path}` : `${uStore.gitIoCdn}/${res.data.content.path}`
        uploadFileRaw.downLink = uploadType === 'picture' ? `${uStore.fileCdn}${res.data.content.path}` : `${uStore.gitIoCdn}/${res.data.content.path}`
        uploadType === 'picture' && imgPreList.push(`${uStore.fileCdn}${res.data.content.path}`)
        console.log("上传文件结果:", res, imgPreList)
      } else {
        ElMessage.error("上传失败:" + res.data.message)
        gitFileList.splice(gitFileList.indexOf(uploadFileRaw), 1)
      }
      upPropress.value = 1
      fileList.length = 0
    }).catch(error => {
      uploadFileRaw.sha = 'error'
      gitFileList.splice(gitFileList.indexOf(uploadFileRaw), 1)
      console.log("上传文件错误:", error);
      upPropress.value = 1
      fileList.length = 0
    })
  }
})

实际使用效果：