element-ui用户名检查

 验证方法
var checkName = async (rule, value, callback) => {
                if (!value) {
                    callback(new Error("不能为空"))
                }else if (value != "") {
                    var result = this.tableData.find(item => item.classify_cn === value);
                    console.log(result);
                    if(result){
                        callback(new Error("名称已存在"))
                    }else{
                        callback()
                    }
                }
                callback();
            };

rules: {
    classify_cn: [
        { required: true,validator: checkName,trigger: "blur" },
    ],
  
}