1、首先在el-form标签加上ref和:rules属性，并且在每个el-form-item标签里定义prop属性，prop属性跟:rules里面的每项对应，如：
<el-form :model = " dialogFormData " label-width = "150px" ref = "dialogFormRef" :rules = " dialogFormRules " >
<el-form-item label = "uniqueID" prop = "uniqueID" >
<el-input v-model = " dialogFormData.uniqueID " placeholder = "" ></el-input>
</el-form-item>
</el-form>
2、在data里面定义rules属性值
dialogFormRules: {
uniqueID: [{required: true , message: '必填' }, {validator: MyValid.validSixNum}]
}
3、验证表单
this .$refs[ 'dialogFormRef' ].validate((valid) => {
在这里判断valid的true或false
}
4、自定义验证方法的例子：
//验证长度为6的全数字
validSixNum (rule, value, callback){
var valArr = value.split( '' );
console.log( 'vali six num: ' + valArr.length);
if(valArr.length != 6){
return callback(new Error('长度必须是6'));
}
var re = new RegExp( "^{6}[0-9]*$" );
if ( ! re.test(value)){
return callback( new Error( '必须是纯数字' ));
}
callback();
}