vue系列---【element-ui如何给表单添加参数验证？】

需求：element-ui如何给表单添加参数验证？
1.在需要校验的表单上绑定校验规则：:rules="loginFormRules"；
2.在data中定义loginFormRules规则对象：loginFormRules：{username: [{ required: true, message: '请输入用户名', trigger: 'blur' },
  { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }],password: []}；
3.在需要校验的具体表单上引入prop="username"属性。

示例代码：

<template>
  <div class="login-container">
    <div class="login_box">
      <!--头像区域-->
      <div class="avatar_box">
        <img src="../assets/logo.png">
      </div>
      <!--登陆表单区域-->
      <el-form :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
      <!--用户名-->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"></el-input>
        </el-form-item>
        <!--密码-->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" type="password" prefix-icon="el-icon-lock"></el-input>
        </el-form-item>
        <!--按钮区域-->
        <el-form-item class="btns">
          <el-button type="primary">登陆</el-button>
          <el-button type="info">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      loginForm: {
        username: 'li',
        password: 'zz'
      },
      // 1.在需要校验的表单上绑定校验规则：:rules="loginFormRules"；
      // 2.在data中定义loginFormRules规则对象：loginFormRules：{username: [{ required: true, message: '请输入用户名', trigger: 'blur' },
      // { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }],password: []}；
      // 3.在需要校验的具体表单上引入prop="username"属性。
      loginFormRules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  }
}
</script>

<style lang="less" scoped>
.login-container {
  background-color: #2b4b6b;
  height: 100%;
  .avatar_box {
    height: 130px;
    width: 130px;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    background-color: white;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    img {
      height: 100%;
      width: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
.login_box {
  background-color: #fff;
  height: 300px;
  width: 450px;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%);
}
  .btns {
    /*尾部对齐*/
    display: flex;
    justify-content: flex-end;
  }
</style>