<?php 
  header("Content-type:text/html;charset=utf-8");
  $arr = array("state"=>0,"data"=>array(),"msg"=>'');
  $phone = $_POST['phone'];
  $password = $_POST['password'];
  if($phone && $password){
	//省略验证......
 
	//返回登录token
	$tokenstr = 'liweishan666';
	$token = $phone.time().$tokenstr;//省略加密
 
	$arr['state'] = 1;
	$arr['msg'] = '登录成功';
	$arr['data']['token'] = $token;
  }else{
	$arr['msg'] = '参数错误';
  }
  echo json_encode($arr);
  die;
	

<form bindsubmit="formSubmit" bindreset="formReset">
 <view>
  手机号：<input type="text" name="phone" placeholder="请输入账号" confirm-type="done" />
  密码：<input password type="number" name="password" placeholder="请输入6位密码" maxlength="6" />
 </view>
 <view class="btn-area">
  <button formType="submit">登录</button>
 </view>
 
 <view class="btn-area">
  <button bindtap="gettoken">读取缓存token</button>
 </view>
 
 <view class="btn-area">{{token}}</view>
</form>

Page({
 formSubmit: function (e) {
  wx.request({
   url: 'https://www.msllws.top/login.php',
   data: {
    'phone': e.detail.value.phone,
    'password': e.detail.value.password
   },
   method: 'POST',
   header: {
    'Content-Type': 'application/x-www-form-urlencoded'
   },
   success: function (res) {
    console.log(res.data);
    //以键值对的形式存储到本地缓存
    wx.setStorage({
     key: "token",
     data: res.data.data.token
    })
   },
   fail: function () { },
   complete: function () { }
  })
 },
 
 gettoken: function (e) {
  var that = this
  wx.getStorage({
   key: 'token',
   success: function (res) {
    that.setData({'token': res.data})
   },
   fail: function () { },
   complete: function () { }
  })
 }
})

wx.removeStorage({
 key: 'token',
 success (res) {
  console.log(res.data)
 } 
})

wx.clearStorage()