上传图片

原生js上传图片

<input type="file" id="fileId" onchange="changeFn()">
<script>
    function changeFn(){
        let fileDom = document.getElementById('fileId');
        // console.log(fileDom);
        let file = fileDom.files[0];
        let formdata = new FormData();
        formdata.append('file',file)
        let xhr = new XMLHttpRequest();
        xhr.open('post',url,false);
        xhr.setRequestHeader('Authorization',localStrorage.token)
        xhr.onreadystatechange = function(){
            if(xhr.readyState==4){
                console.log(JSON.parse(xhr.responseText));
                let {meta} = JSON.parse(xhr.responseText);
                if(meta.status==200){
                    alert(meta.msg)
                }
            }
        }
        xhr.send(formdata)
    }
</script>

element图片上传组件

<template>
  <div>
    <el-upload
    v-loading="loading"
      action="****"
      :headers="headers"
      :on-success="successfn"
      :on-error="errorfn"
      :on-progress="progressfn"
      :on-preview="handlePreview"
      :on-remove="handleRemove"
      :before-remove="beforeRemove"
      multiple
      :limit="3"
      :on-exceed="handleExceed"
      :file-list="fileList"
    >
      <el-button size="small" type="primary">点击上传</el-button>
      <div slot="tip" class="el-upload__tip">
        只能上传jpg/png文件，且不超过500kb
      </div>
    </el-upload>
  </div>
</template>

<script>
export default {
  data() {
    return {
      fileList: [],
      loading:false,
      headers:{
        Authorization:localStorage.token
      }
    };
  },
  methods: {
    successfn(response, file, fileList){
      console.log(response, file, fileList);
      let {meta} = response;
      if(meta.status==200){
        this.$message.success(meta.msg)
      }else{
        this.$message.error(meta.msg)
      }
      setTimeout(() => {
        this.loading=false
      }, 500);
    },
    errorfn(err, file, fileList){
      console.log(err, file, fileList);
    },
    progressfn(event, file, fileList){
      console.log(event, file, fileList);
      this.loading=true
    },
    handleRemove(file, fileList) {
      console.log(file, fileList);
    },
    handlePreview(file) {
      console.log(file);
    },
    handleExceed(files, fileList) {
      this.$message.warning(
        `当前限制选择 3 个文件，本次选择了 ${files.length} 个文件，共选择了 ${
          files.length + fileList.length
        } 个文件`
      );
    },
    beforeRemove(file) {
      return this.$confirm(`确定移除 ${file.name}？`);
    },
  },
};
</script>

<style>
</style>