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百度智能小程序同步移除指定key

2020-09-05 14:15 更新

swan.removeStorageSync

解释：从本地缓存中同步移除指定 key。

方法参数

String keykey参数说明：本地缓存中的指定的 key。

示例

在开发者工具中打开

图片示例

代码示例

<view class="wrap">
    <view class="card-area">
        <view class="list-area border-bottom">
            <label class="list-item-key-4">key</label>
            <input class="list-item-value" bindfocus="keyFocus" bindinput="keyInput" type="text" value="{{key}}" placeholder="请输入key" />
        </view>
        <view class="list-area border-bottom">
            <label class="list-item-key-4">value</label>
            <input class="list-item-value" bindfocus="valueFocus" bindinput="valueInput" type="text" value="{{value}}" placeholder="请输入value" />
        </view>
        <view>
            <button bindtap="setStorage" type="primary" hover-stop-propagation="true">存储数据</button>
            <button bindtap="getStorage" type="primary" hover-stop-propagation="true" disabled="{{disabled}}">读取数据</button>
            <button bindtap="getStorageInfo" type="primary" disabled="{{disabled}}">获取存储数据信息</button>
            <button bindtap="removeStorageSync" type="primary" hover-stop-propagation="true" disabled="{{disabled}}">移除第一个key对应的value值</button> 
        </view>
    </view>
</view>

Page({
    data: {
        key: '示例Key',
        value: '示例Value',
        disabled: true
    },
    keyInput(e) {
        this.setData('key', e.detail.value);
    },
    valueInput(e) {
        this.setData('value', e.detail.value);
    },
    valueFocus() {
        this.setData('value', '');
    },
    keyFocus() {
        this.setData('key', '');
    },
    setStorage() {
        let key = this.hasKey();
        if (!key) {
            return;
        }
        swan.setStorage({
            key,
            data: this.getData('value'),
            success: res => {
                this.toast('存储成功', 'none');
                this.setData('disabled', false);
            },
            fail: err => {
                this.toast('存储数据失败');
            }
        });
    },
    getStorage() {
        let key = this.hasKey();
        if (!key) {
            return;
        }
        swan.getStorage({
            key,
            success: res => {
                const data = res.data;
                if (data) {
                    swan.showModal({
                        title: '数据信息',
                        content: `${key}: ${data}`,
                        showCancel: false
                    });
                } else {
                    this.toast('找不到key对应的值');
                }
            },
            fail: err => {
                this.toast('读取数据失败');
            }
        });
    },
    getStorageInfo() {
        swan.getStorageInfo({
            success: res => {
                swan.showModal({
                    title: '',
                    content: JSON.stringify(res) 
                })
                this.setData({keysList: res.keys});
                console.log('getStorageInfo success', res);
            },
            fail: err => {
                console.log('getStorageInfo fail', err);
            }
        });
    },
    removeStorageSync() {
        swan.getStorageInfo({
            success: res => {
                let result = swan.removeStorageSync(res.keys[0]);
                // 基础库 3.140.1 之前，无法判断接口是否调用失败
                // 基础库 3.140.1 及以后，通过 instanceof 来判断是否未传必传值`key`或接口是否调用失败
                if (!(result instanceof Error)) {
                    this.toast('removeStorageSync success', 'none');
                }
                else {
                    this.toast('removeStorageSync fail', 'none');
                }
                console.log('getStorageInfo success', res);
            },
            fail: err => {
                console.log('getStorageInfo fail', err);
            }
        });
    },
    hasKey() {
        let key = this.getData('key');
        if (key) {
            return key;
        }
        this.toast('key不能为空');
    },
    toast(title, icon = 'none') {
        swan.showToast({title, icon});
    }
});