vue中input框怎么做校验 怎么让他只能输入文字并且对输入的文字做判断 还有对输入的字符串长度做判断

<template>
  <div>
     <el-form
      :model="ruleForm"
      :rules="rules"
      ref="ruleForm"
      label-width="100px"
      class="demo-ruleForm"
    >
      <el-form-item label="活动名称" prop="name">
        <el-input v-model="ruleForm.name"></el-input>
      </el-form-item>
       </el-form
    >
  </div>
</template>

<script>
export default {
  name: "",
  data() {
    return {
      ruleForm: {
        name: "",
      },
      rules: {
        name: [
          { required: true, message: "请输入活动名称", trigger: "blur" },
          { min: 3, max: 5, message: "长度在 3 到 5 个字符", trigger: "blur" },
          {
            pattern: /^[\u4e00-\u9fa5]+$/,
            message: "请输入正确的活动名称",
            trigger: "blur",
          },
        ],
      },
    };
  },
};
</script>

<style lang="scss" scoped>
</style>