uniapp如何手动实现让input文本框聚焦效果

<template>
	<view class="content">
		<!-- 此处省略... -->
		<view class="expand">
			<input class="input" type="text" v-model="value" focus="true"/>
		</view>
		<!-- 此处省略... -->
	</view>
</template>

<template>
	<view class="content">
		<!-- 此处省略... -->
		<view class="expand">
			<input class="input" type="text" v-model="value" :focus="isInputFocus" @blur="onblur"/>
		</view>
		<!-- 此处省略... -->
	</view>
</template>

export default {
		data() {
			return {
				//...
				value:'',
				isInputFocus:true,
			};
		},
		methods:{
			onblur(){
				this.isInputFocus=false;
			},
			//...
		}
	}

this.$nextTick(()=>{
	this.value='';
	this.isInputFocus=true;
})

<input :focus="firstFocus" type="text" value="" placeholder="请输入药品名称" />

export default {
    data() {
        return {
            firstFocus:false,
        }
    },
}

onLoad(options) {
    var that = this;
    that.firstFocus = false;
    setTimeout(function(){
        that.firstFocus = true;
    },500)
}