微信小程序开发内测一个月.数据传递的方式很少.经常遇到页面销毁后回传参数的问题,小程序中并没有类似Android的startActivityForResult的方法,也没有类似广播这样的通讯方式,更没有类似eventbus的轮子可用.
现在已知传递参数的方法只找到三种,先总结下.由于正处于内测阶段,文档也不是很稳定,经常修改,目前尚没有人造轮子.
先上GIF:
1.APP.js
我把常用且不会更改的参数放在APP.js的data里面了.在各个page中都可以拿到var app = getApp();
app上就可以拿到存在data中的参数.
2. wx.navigateTo({})中URL携带参数
demo中已经写出:
wx.navigateTo({
url: "../newpage/newpage?infofromindex=" + this.data.infofromindex,
});
页面间传递参数的笔记
3.wx.setStorage(OBJECT) 数据缓存
微信开发文档中的数据缓存方法:
①存储数据
try {
wx.setStorageSync('infofrominput', this.data.infofrominput)
} catch (e) {
}
②获取数据
//获取
wx.getStorage({
key: 'infofrominput',
success: function (res) {
_this.setData({
infofromstorage: res.data,
})
}
})
key是本地缓存中的指定的 key,data是需要存储的内容.
详情见微信小程序开发文档:文档
贴上代码:
1.index.js
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-
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var app = getApp()
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Page({
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data: {
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info: app.data.info,
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infofromindex: '来自index.js的信息',
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infofrominput: ''
-
},
-
onLoad: function () {
-
},
-
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gotonewpage: function () {
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wx.navigateTo({
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url: "../newpage/newpage?infofromindex=" + this.data.infofromindex,
-
});
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},
-
-
searchInputEvent: function (e) {
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console.log(e.detail.value)
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this.setData({ infofrominput: e.detail.value })
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},
-
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saveinput: function () {
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try {
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wx.setStorageSync('infofrominput', this.data.infofrominput)
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} catch (e) {
-
}
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}
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})
2.index.wxml
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<view>
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<button style="background-color:#00ff00;margin:20rpx" bindtap="gotonewpage">跳转</button>
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<input style="background-color:#eee;margin:20rpx;height:80rpx" placeholder="请输入需要保存的参数" bindinput="searchInputEvent" />
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<button style="background-color:#ff0000;margin:20rpx" bindtap="saveinput">存入Storage</button>
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</view>
3.newpage.js
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var app = getApp()
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Page({
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data: {
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infofromapp: app.data.infofromapp,
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infofromindex: '',
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infofromstorage: '',
-
},
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onLoad: function (options) {
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var _this = this;
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var infofromindex = options.infofromindex;
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this.setData({
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infofromindex: infofromindex
-
})
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wx.getStorage({
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key: 'infofrominput',
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success: function (res) {
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_this.setData({
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infofromstorage: res.data,
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})
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}
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})
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}
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})
4.newpage.wxml
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<view style="width:100%;margin:30rpx">infofromapp:{{infofromapp}}</view>
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<view style="width:100%;margin:30rpx">infofromindex:{{infofromindex}}</view>
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<view style="width:100%;margin:30rpx">infofromstorage:{{infofromstorage}}</view>
5.app.js
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App({
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data: {
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infofromapp: '来自APP.js的信息'
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},
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onLaunch: function () {
-
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}
-
})
