<el-form :model="form" :rules="rules" ref="form" label-width="110px" autocomplete="false"> 
<el-form-item label="商户名称" prop="name"> 
<el-input v-model="form.name" size="small" placeholder="请输入商户名称"></el-input> 
</el-form-item>
</el-form>

var judgeName = (rule, value, callback) =>{ 
    if(validateNull(value)){ 
   return callback(new Error("请输入商户名称"));
 
}else{
 
  repetitionName(this.form.id,this.form.name).then(response => { 
    if(response.success) { 
        if(response.data){ 
           return callback(new Error("商户名称已存在")); 
        }else{ 
        callback(); 
        }
 
   } else { 
     callback(); 
  }
 
}); 
} 
}

rules: { 
name: [ 
{ 
required: true, 
validator: judgeName, 
trigger: "blur" 
} 
] 
}

<el-form-item label="商户名称" prop="name" :error="errorMsg"> 
<el-input v-model="form.name" size="small" placeholder="请输入商户名称"></el-input> 
</el-form-item>

channelAdd(this.form).then(response => {
       if (response.success) {
        //成功的结果
        this.$message({
         message: response.message,
         type: "success",
         duration: 2000
        });
       } else {
         //错误信息
        this.errorMsg = response.message
       }
      });