我就想用两个字符串合成图像的真实路径，习惯上用+，结果报错，不知道JS在页面该怎么组合字符串

wxml文件：
<view class = "order_type_button" wx:for="{{order_type}}" wx:key="id">
    <view class = "align_center_hori">
        <image class = "toolbar_botton_icon" mode='scaleToFill' src='../../images/person/' + '{{item.image}}'></image>
    </view>
</view>

js文件：
data: {
    order_type: [
        { image: "order_wait_pay.png" },
        { image: "order_wait_deliver.png" },
        { image: "order_wait_receive.png" },
        { image: "order_finish.png" },
        { image: "order_after_service.png" }
    ]
},