<el-form-item label="手机号" prop="tel">
        <el-input
          v-model="ruleForm.tel"
          placeholder="请输入手机号"
          οninput="value=value.replace(/[^\d]/g,‘‘);if(value.length > 11)value = value.slice(0, 11)"
        ></el-input>
 </el-form-item>

rules: {
        tel: [
          { required: true, message: "手机号不能为空", trigger: "blur" },
          { min: 11, message: "手机号格式不正确", trigger: "blur" }
        ]
}