[SOLVED] The console prompts XXX is not definded error solution in Vue

Project scene:

I made an error when listening to the teacher talk about the Vue project today.

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Problem Description:

The items consistently appear XXX is not defined.

data() {
    
    
    var validatePass = (rule, value, callback) => {
    
    
      var oldPw = /^[a-zA-Z0-9]{
    
    3,15}$/;
      if (value == "") {
    
    
        callback(new Error("请输入密码"));
      } else {
    
    
        if (!oldPw.test(value)) {
    
    
          callback(new Error("请输入正确的密码"));
        }
        callback();
      }
    };
    //   var validataPass2 = (rule, value, callback) => {
    
    
    //       var oldPw = /^[a-zA-Z0-9]{3,15}$/;
    //       if (value == "") {
    
    
    //         callback(new Error("请输入密码"));
    //       } else if(value!==this.ruleForm.oldPw){
    
    
    //           callback(new Error("两次输入的密码不一致"));
    //         }else{
    
    
    //    callback();
    //         }
    //       }
    //     };

    return {
    
    
      userName: "",
      dialogVisible: false,
      name: "海海",
      ruleForm: {
    
    
        oldPw: "",
        newPw: "",
        age: "",
      },
      rules: {
    
    
        oldPw: [{
    
     required: true, validator: validatePass, trigger: "blur" }],
        newPw: [{
    
     required: true, validator: validatePass, trigger: "blur" }],
      },
    };
  },
       

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Cause Analysis:

After searching for a long time, it turns out that the validatePass variable is not defined, and the word is mistyped O(∩_∩)O! [Insert image description here](https://img-blog.csdnimg.cn/20201014164142296.png?x-oss- process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzMDU1ODU1,size_16,color_FFFFFF,t_70#pic_center).

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solution:

1. It is generally prompted that certain values ​​and variable methods will report this error when the letter is typed incorrectly. Check carefully whether the name of the variable is typed incorrectly.

2. Change validataPass to validatePass . When typing code, I always like to type date as data ---- data means data, and date means date .