Combination use of wx.request and Promise of WeChat applet
Mar 19, 2018 pm 04:28 PM
This time I will bring you the combined use of wx.request and Promise in the WeChat applet. What are the precautions for the combined use of wx.request and Promise in the WeChat applet? The following is a practical case. Let’s take a look.
When using Promise, my multiple asynchronous codes usually look like this.ajax(url,?function?(res){
????ajax(res.url,?function(res)?{
????????ajax(res.url,?function(res)?{????????????if?(res.status?==?'1')?{
????????????????ajax(res.url,?function(res)?{
????????????????...
????????????????}
????????????}????????????else?if?(res.status?==?'2')?{
????????????????ajax(url2,?function(res)?{
????????????????...
????????????}
????????????...
????????}
????}
}
);This kind of process is very labor-intensive and fragile, and the experience is very bad. Therefore, in this small program In order to have a better experience in the development, I started to use Promise.The code is as follows. In this way, when our second request requires the first parameter judgment, we can no longer fall into callback hell,
//?小程序與后端情求接口
????let?baseUrlPromise?=?'https://xxx.com';????//?定義方法返回Promise參數(shù),obj?為wx.request?方法中所需參數(shù)
????let?req?=?function?(obj)?{??????return?new?Promise(function?(resolve,?reject)?{
????????wx.request({
??????????url:?baseUrlPromise?+?obj.url,
??????????data:?obj.data,
??????????header:?obj.header,
??????????method:?obj.method?==?undefined???"get"?:?obj.method,
??????????success:?function?(data)?{????????????//?回調(diào)成功執(zhí)行resolve????????????resolve(data)
??????????},
??????????fail:?function?(data)?{????????????//?回調(diào)失敗時(shí)
????????????if?(typeof?reject?==?'function')?{
??????????????reject(data);
????????????}?else?{
??????????????console.log(data);
????????????}
??????????},
????????})
??????})
????}????//?執(zhí)行req?方法,傳入第一個(gè)請(qǐng)求,
????let?req1?=?req({
??????url:?'第一次請(qǐng)求鏈接,與baseUrlPromise?相結(jié)合',
??????data:?{},
????})????//?當(dāng)需要多次請(qǐng)求時(shí)加入
????req1.then(function?(data)?{
??????console.log('promiseThen1')
??????console.log(data);??????return?req({
????????url:?'第二次請(qǐng)求鏈接',
??????})
????}).then(function?(data)?{
??????console.log('promiseThen3')
??????console.log(data);??????return?req({
????????url:'第三次請(qǐng)求鏈接'
??????})
???}).then(......).catch(function(data){
??????console.log(PromiseCatch)
???}) I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website! Recommended reading:
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