Question

我正在使用以下代码从React Native中的Array中删除一项：

var array = [...this.state.gallery];
if (index !== -1) {
   array.splice(index, 1);
   this.setState({gallery: array,
   photosHaveNow: this.state.photosHaveNow - 1});
}

但是，当删除项目时，该数组将写入您的位置：

{"empty": true, "key": "blank-2"}

最终示例：

["http://parquedasfeiras.online/wp-content/uploads/2019/09/WhatsApp-Image-2019-11-30-at-00.38.33.jpeg", "http://parquedasfeiras.online/wp-content/uploads/2019/09/WhatsApp-Image-2019-11-30-at-00.38.33-1.jpeg", "http://parquedasfeiras.online/wp-content/uploads/2019/09/WhatsApp-Image-2019-11-30-at-00.38.33-2.jpeg", "http://parquedasfeiras.online/wp-content/uploads/2019/09/WhatsApp-Image-2019-11-30-at-00.38.33-3.jpeg", "http://parquedasfeiras.online/wp-content/uploads/2019/09/WhatsApp-Image-2019-11-30-at-00.38.34.jpeg", "http://parquedasfeiras.online/wp-content/uploads/2019/09/WhatsApp-Image-2019-11-30-at-00.38.34-1.jpeg", "http://parquedasfeiras.online/wp-content/uploads/2019/09/WhatsApp-Image-2019-11-30-at-00.38.34-4.jpeg", {"empty": true, "key": "blank-2"}, {"empty": true, "key": "blank-2"}, {"empty": true, "key": "blank-2"}, {"empty": true, "key": "blank-2"}, {"empty": true, "key": "blank-2"}]

当通过接头移除一个项目时，放置了“ {{empty”：true，“ key”：“ blank-2“}”，希望没有任何放置。

Answer 1

我相信我已经找到了解决方案。我不知道这听起来是否不错。

    var array = [...this.state.gallery];

    if (index !== -1) {
        array.splice(index, 1);
    }

    var finalArray = [];

    array.forEach(element => {
        if(typeof element !== 'object')
        {
            finalArray = finalArray.concat(element)
        }
    })

    this.setState({
        gallery: finalArray,
        photosHaveNow: this.state.photosHaveNow - 1
    })

拼接数组为空值

1 个答案: