在使用表单提交数据时，表单校验可对输入数据进行验证，保证输入数据的格式正确。

表单校验

<template>
  <div class="container">
    <el-form
      :model="ruleForm"
      status-icon
      :rules="rules"
      ref="ruleForm"
      label-width="100px"
      class="demo-ruleForm"
    >
      <el-form-item label="密码" prop="pass">
        <el-input
          type="password"
          v-model="ruleForm.pass"
          autocomplete="off"
        ></el-input>
      </el-form-item>
      <el-form-item>
        <password-line :passwordVal="ruleForm.pass"></password-line>
      </el-form-item>
      <el-form-item label="确认密码" prop="checkPass">
        <el-input
          type="password"
          v-model="ruleForm.checkPass"
          autocomplete="off"
        ></el-input>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" @click="submitForm('ruleForm')"
          >提交</el-button
        >
        <el-button @click="resetForm('ruleForm')">重置</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
import PasswordLine from "./PasswordLine"; // 引入密码复杂度校验组件
export default {
  components: {
    PasswordLine,
  },
  data() {
    var validatePass = (rule, value, callback) => {
      if (value === "") {
        callback(new Error("请输入密码"));
      } else {
        if (this.ruleForm.checkPass !== "") {
          this.$refs.ruleForm.validateField("checkPass");
        }
        callback();
      }
    };
    var validatePass2 = (rule, value, callback) => {
      if (value === "") {
        callback(new Error("请再次输入密码"));
      } else if (value !== this.ruleForm.pass) {
        callback(new Error("两次输入密码不一致!"));
      } else {
        callback();
      }
    };
    return {
      ruleForm: {
        pass: "",
        checkPass: "",
      },
      rules: {
        pass: [{ validator: validatePass, trigger: ["blur", "change"] }],
        checkPass: [{ validator: validatePass2, trigger: ["blur", "change"] }],
      },
    };
  },
  methods: {
    submitForm(formName) {
      this.$refs[formName].validate((valid) => {
        if (valid) {
          alert("submit!");
        } else {
          console.log("error submit!!");
          return false;
        }
      });
    },
    resetForm(formName) {
      this.$refs[formName].resetFields();
    },
  },
};
</script>
<style scoped>
.container {
  padding-right: 100px !important;
  padding: 30px;
  width: 400px;
  height: 200px;
  border: 2px dashed skyblue;
}
</style>

密码复杂度校验组件

PasswordLine.vue

<template>
  <div class="line-container" v-show="showProgress">
    <div
      class="line"
      :style="{ width: `${progressPercent}%`, background: bgColor }"
    ></div>
    <div class="tipWord" :style="{ color: bgColor }">
      {{ tipWord }}
    </div>
  </div>
</template>

<script>
export default {
  name: "PasswordLine",
  props: {
    passwordVal: {
      type: String,
      default: "",
    },
  },
  data() {
    return {
      bgColor: "",
      tipWord: "",
    };
  },
  watch: {
    progressPercent(v) {
      if (v === 95) {
        this.bgColor = "#64BC38";
        this.tipWord = "Complex";
      } else if (v === 50) {
        this.bgColor = "#FAAD14";
        this.tipWord = "Medium";
      } else {
        this.bgColor = "#F56C6C";
        this.tipWord = "Simple";
      }
    },
  },
  computed: {
    showProgress() {
      return this.passwordVal.length >= 8;
    },
    progressPercent() {
      if (!this.passwordVal) return 0;
      // n:数字  l:小写字母  u:大写字母  s:特殊字符
      const result = this.passwordVal
        .split("")
        .map((val) => val.charCodeAt())
        .reduce(
          (pre, val, index) => {
            if (val < 48) pre.special += 1;
            else if (val < 58) pre.num += 1;
            else if (val < 65) pre.special += 1;
            else if (val < 91) pre.upper += 1;
            else if (val < 97) pre.special += 1;
            else if (val < 123) pre.lower += 1;
            else pre.special += 1;
            return pre;
          },
          { num: 0, lower: 0, upper: 0, special: 0 }
        );

      const arr = Object.values(result);

      const len = this.passwordVal.length;
      const zCount = this.zeroCount(arr)["0"];

      if (len >= 8) {
        if (!zCount) {
          return 95;
        } else if (zCount === 1 || zCount === 2) {
          return 50;
        } else {
          return 28;
        }
      }
    },
  },
  methods: {
    zeroCount(arr) {
      return arr.reduce((prev, next) => {
        prev[next] = prev[next] + 1 || 1;
        return prev;
      }, {});
    },
  },
};
</script>

<style scoped>
.line-container {
  position: relative;
  top: -10px;
}
.line-container,
.line {
  background: #d9dae0;
  height: 8px;
  border-radius: 4px 5px 5px 4px;
}
.tipWord {
  position: absolute;
  left: 0;
  top: -2px;
  font-size: 12px;
}
</style>