el-upload组件限制上传个数

element上传文件需要限制上传个数，结合limit和:on-exceed去处理。

<el-upload 
         ref="upload" 
         :action="uploadUrl()"
         multiple
         :limit="5"
         :on-preview="handlePreview"
         :on-remove="handleRemove"
         :file-list="fileList"
         :on-success="uploadSuccess"
         :on-exceed="masterFileMax"
         :before-remove="beforeRemove">
         <el-button size="mini">上传附件</el-button>
 </el-upload>

　　

methods: {
      masterFileMax(files, fileList) {
            console.log(files, fileList);
            this.$message.warning(`请最多上传 ${this.limit} 个文件。`);
        }
}