微信小程序 POST请求（网络请求）详解及实例代码

微信小程序 POST请求

微信小程序开发中网络请求必不可少.GET.POST请求是最常用的.GET请求，POST请求的时候有好几个坑.我已经为大家填好了.

<img src="http://img.blog.csdn.net/20161017170933243?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" align="middle" alt="" />

按照文档,肯定是这么写.那就入坑了.

1. 'Content-Type': 'application/json'用在get请求中没问题.

POST请求就不好使了.需要改成: "Content-Type": "application/x-www-form-urlencoded"

2016.11.10更新:有同学在将content-type 修改为小写后,post请求成功.

2. 加上method: "POST"

3.data: { cityname: "上海", key: "1430ec127e097e1113259c5e1be1ba70" }写成json格式这样也是请求不到数据的.需要转格式.

下面直接贴代码:

 3.1

<span style="font-size:24px;">//index.js 
//获取应用实例 
var app = getApp() 
Page( { 
 data: { 
  toastHidden: true, 
  city_name: '', 
 }, 
 onLoad: function() { 
  that = this; 
  wx.request( { 
   url: "http://op.juhe.cn/onebox/weather/query", 
   header: { 
    "Content-Type": "application/x-www-form-urlencoded" 
   }, 
   method: "POST", 
   //data: { cityname: "上海", key: "1430ec127e097e1113259c5e1be1ba70" }, 
   data: Util.json2Form( { cityname: "上海", key: "1430ec127e097e1113259c5e1be1ba70" }), 
   complete: function( res ) { 
    that.setData( { 
     toastHidden: false, 
     toastText: res.data.reason, 
     city_name: res.data.result.data.realtime.city_name, 
     date: res.data.result.data.realtime.date, 
     info: res.data.result.data.realtime.weather.info, 
    }); 
    if( res == null || res.data == null ) { 
     console.error( '网络请求失败' ); 
     return; 
    } 
   } 
  }) 
 }, 
 onToastChanged: function() { 
  that.setData( { toastHidden: true }); 
 } 
}) 
var that; 
var Util = require( '../../utils/util.js' );</span>

3.2

<span style="font-size:24px;"><!--index.wxml--> 
<view class="container"> 
  <toast hidden="{{toastHidden}}" bindchange="onToastChanged"> 
    {{toastText}} 
  </toast> 
  <view>{{city_name}}</view> 
  <view>{{date}}</view> 
  <view>{{info}}</view> 
</view></span>

3.3

<span style="font-size:24px;">//util.js 
function json2Form(json) { 
  var str = []; 
  for(var p in json){ 
    str.push(encodeURIComponent(p) + "=" + encodeURIComponent(json[p])); 
  } 
  return str.join("&"); 
} 
module.exports = { 
 json2Form:json2Form, 
}</span>

希望对大家有帮助.