[JavaScript知识库]Vue3.2 组件实例练习

Vue3.2 组件实例练习

版本说明

node v14.17.0

vite v2.6.4

yarn v1.22.11

typescript v4.4.3

vue v3.2.16

创建项目

使用vite

yarn create vite TestPro --template vue-ts

安装依赖

cd TestPro
yarn 

启动项目

yarn dev

安装依赖完成的package.json

{
  "name": "testpro",
  "version": "0.0.0",
  "scripts": {
    "dev": "vite",
    "build": "vue-tsc --noEmit && vite build",
    "serve": "vite preview"
  },
  "dependencies": {
    "vue": "^3.2.16"
  },
  "devDependencies": {
    "@vitejs/plugin-vue": "^1.9.3",
    "typescript": "^4.4.3",
    "vite": "^2.6.4",
    "vue-tsc": "^0.3.0"
  }
}

新建组件

MyInput.vue

<script lang="ts" setup>
import { computed, onMounted, ref } from "@vue/runtime-core";
// 接收绑定的参数
let props = defineProps({
  name: {
    type: String,
    required: true,
  },
  type: {
    type: String,
    validator(value: string): boolean {      // 绑定自定义的属性验证
      return ["password", ""].includes(value);
    },
  },
  validator: {
    type: RegExp,          // 验证字符串是正则类型
  },
  validator_success: {
    type: String,
  },
  validator_error: {
    type: String,
  },
});
// 接收父组件的方法
let emit = defineEmits(["update:name"]);
// 绑定 input 事件
let OnInput = (ev: Event): void => {
  // 执行父组件的方法
  emit("update:name", (ev.target as any).value); // 此处为了防止ts报类型错误
};

// 输入框的样式 如果是密码框需要
let inputtype = ref("text");
onMounted(() => {
  if (props.type == "password") {
    inputtype.value = "password";
  }
});
// 验证信息显示
let tip = computed(() => {
  return props.name && props.validator ? true : false;
});
// 验证结果显示的颜色
let tipcolor = computed(() => {
  // 验证结果
  if (props.validator && props.validator.test(props.name)) {
    // 有验证且验证成功
    return "green";
  } else {
    return "red";
  }
});
// 验证信息
let tipmsg = computed(() => {
  if (props.validator && props.validator.test(props.name)) {
    // 有验证且验证成功
    return "√ " + (props.validator_success || "验证成功！");
  } else {
    return "× " + (props.validator_error || "验证失败！");
  }
});
</script>
<template>
  <div class="container">
    <div class="input-data">
      <input :type="inputtype" required :value="name" @input="OnInput" />
      <!-- @input可以使用下面的这个，但是会报ts类型错误，虽然并不影响显示结果 -->
      <!-- @input="$emit('update:name', $event.target.value)" -->
      <label>
        <slot name="default"> name </slot>
      </label>
      <div class="line"></div>
      <transition>
        <div class="tips" v-if="tip">{{ tipmsg }}</div>
      </transition>
    </div>
  </div>
</template> 
<style scoped>
.container {
  width: 450px;
  background-color: #fff;
  padding: 20px;
}
.container .input-data {
  width: 100%;
  height: 40px;
  position: relative;
}
.container .input-data input {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 100%;
  width: 100%;
  padding-left: 10px;
  border: none;
  outline: none;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-size: 17px;
}
.container .input-data input:focus {
  color: #4158d0;
}
.container .input-data input:focus ~ label {
  color: #333;
}
.container .input-data input:focus ~ label,
.container .input-data input:valid ~ label {
  transform: translateY(-25px);
}

.container .input-data label {
  position: absolute;
  bottom: 10px;
  left: 10px;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  pointer-events: none;
  transition: all 0.3s ease;
  font-size: 20px;
  color: rgb(160, 157, 157, 0.6);
}

.container .input-data .line,
.container .input-data .line:before {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1.5px;
}

.container .input-data .line {
  background-color: gray;
}
.container .input-data .line:before {
  content: "";
  background-color: #4158d0;
  transform: scaleX(0);
  transition: transform 0.4s ease;
}
.container .input-data input:focus ~ .line:before {
  transform: scaleX(1);
}

.container .input-data .tips {
  position: absolute;
  width: 100%;
  height: 15px;
  bottom: -15px;
  font-size: 9px;
  left: 10px;
  text-align: left;
  color: v-bind(tipcolor);  /* vue 3.2 可以为css绑定参数 */
  transition: all 0.3s ease;
}
</style>

在App.vue中注册使用

<script setup lang="ts">
import { ref } from "vue";
import MyInput from "./components/MyInput.vue";
let username = ref("");
let password = ref("");
let validator_username = /[a-zA-Z][a-zA-Z0-9]{8,20}/
</script>

<template>
  <MyInput v-model:name="username" :validator=validator_username> username </MyInput>
  <MyInput v-model:name="password" type="password"> password </MyInput>
</template>