element-ui中Form表单使用自定义验证规则

data() {
    const validatePass = (rule, value, callback) => {
 
      if (value.length < 3) {
 
        callback(new Error("密码不能小于3位"));
 
      } else {
 
        callback();
 
      }
 
    };
 
return {
 
rules: {
 
  password: [
 
          { required: true, trigger: "blur", validator: validatePass },
 
        ]
 
   }
  }