图标下载链接: https://pan.baidu.com/s/1828AidkCKU1KTkw1SvBwQg?pwd=4k7n

共五格信号
信号5为绿色，信号4为绿色，信号3为黄色，信号2为黄色，信号1为红色，信号0为灰色。

子组件

/components/SignalStrength/index.vue 

<!-- 信号强度 -->
<template>
    <div class="signal-strength">
        <img v-if="strength === 5" :src="url5" />
        <img v-else-if="strength === 4" :src="url4" />
        <img v-else-if="strength === 3" :src="url3" />
        <img v-else-if="strength === 2" :src="url2" />
        <img v-else-if="strength === 1" :src="url1" />
        <img v-else :src="url0" />
    </div>
</template>
  
<script lang="ts">
import signal0 from "/@/assets/signal-0.png"
import signal1 from "/@/assets/signal-1.png"
import signal2 from "/@/assets/signal-2.png"
import signal3 from "/@/assets/signal-3.png"
import signal4 from "/@/assets/signal-4.png"
import signal5 from "/@/assets/signal-5.png"
export default {
    name: 'SignalStrength',
    props: {
        // 信号强度，默认满格信号
        strength: {
            type: Number,
            default: 5,
            validator: function (value: number) {
                // 必须为不大于5的整数
                if (value > 5 || value < 0) {
                    return false
                } else {
                    return true
                }
            }
        }
    },
    data() {
        return {
            url0: signal0,
            url1: signal1,
            url2: signal2,
            url3: signal3,
            url4: signal4,
            url5: signal5
        }
    }
}
</script>
  
<style lang="scss" scoped>
.signal-strength {
    width: 16px;
    height: 16px;

    img {
        width: 100%;
        height: 100%;
        -webkit-user-drag: none;
        user-select: none;
    }
}
</style>
  

父组件

strength属性只有5个值，根据信号范围判断

<SignalStrength :strength="1||2||3||4||5" />

效果图