小程序 van-search 自定义 搜索按钮

<van-search
                right-icon=""
                left-icon=""
                placeholder="输入关键字进行全局搜索"
                value="{{newsTitle}}"
                bind:search="onKeyworkSearch"
                bind:clear="onClear"
        bind:change="onChangeVal"
                shape="round"
                use-action-slot
            >
                    <view slot="action" bindtap="onKeyworkSearch">
                        <van-icon name="search" class="searchIcon" />
                    </view>
            </van-search>