uni-app中的input限制输入两位小数

<input v-model="inputAmount" type="digit" @input="replaceInput" />

replaceInput(event) {
    // 必须在nextTick中
    this.$nextTick(() => {
        this.inputAmount = event.target.value.match(/^\d*(\.?\d{0,2})/g)[0]
    })
}