实现的效果展示，可以是前缀单位，也可以是后缀单位。实现的思路就是动态修改伪元素 ::before 和 ::after 的 content值

实现二次封装数字框的代码如下：

<template><el-input-numberref="inputNumber"v-model="inputValue"clearable:controls="false":data-content="showPendAttr.value"v-bind="$attrs"class="c-input-number c-input-number-pend":class="{'pend-before': showPendAttr.pend === pendEnum.PRE,'pend-after': showPendAttr.pend === pendEnum.AFTER}"></el-input-number>
</template>
<script lang="ts" setup>
import { ref, computed } from "vue";
enum pendEnum {PRE = "pre", // 前置单位AFTER = "after" // 后置单位
}
type Props = {modelValue: any;pendAttr?: { [key: string]: any };
};
const props = withDefaults(defineProps<Props>(), {modelValue: ""
});
const emit = defineEmits(["update:modelValue", "search"]);const inputNumber = ref();// 处理input输入框双向绑定
const inputValue = computed({get: () => {return props.modelValue;},set: (val: any) => {emit("update:modelValue", val);}
});
// 这里是处理pendAttr参数的，用新传入的pendAttr的参数替换默认的
const showPendAttr = computed(() => {let defaultPendAttr: { [key: string]: any } = { pend: pendEnum.PRE, value: ""};defaultPendAttr = { ...defaultPendAttr, ...props.pendAttr };return defaultPendAttr;
});
defineExpose({inputNumber
});
</script>
<style lang="scss" scoped>
.c-input-number {position: relative;
}
.c-input-number-pend::before,
.c-input-number-pend::after {position: absolute;top: 50%;z-index: 1;display: inline-block;font-size: 13px;text-align: center;transform: translateY(-50%);
}
.pend-before::before {left: 12px;content: attr(data-content);
}
.pend-after::after {right: 12px;content: attr(data-content); // 可以获取自定义传值实现动态修改content
}// 以下代码是解决单位重叠
.pend-before {:deep(.el-input__wrapper) {padding-left: 32px !important;}
}
.pend-after {:deep(.el-input__wrapper) {padding-right: 32px !important;}
}
</style>

使用：

<el-form-item label="入款金额:" prop="money"><c-input-numberv-model="configForm.money":min="0":pendAttr="{ pend: 'pre', value: '$' }"placeholder="请输入入款金额"style="width: 300px"</c-input-number>
</el-form-item>