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>