微信小程序之获取php后台数据库转化的json

php代码：

query($sql);
	if ($result->num_rows > 0)
	{
		while($row = $result->fetch_assoc()) // 将表中的数据都取出来
		{
			$u_p = array();
			// echo "username: ".$row['username']." password: ".$row["password"];
			$u_p['username'] = $row['username'];
			$u_p['password'] = $row['password'];
			$userandpass[] =  $u_p;
		}
	}
	// $userandpass['username'] = $username;
	// $userandpass['password'] = $password;
	echo json_encode($userandpass);
?>

js代码：

// index.js
// 获取应用实例
const app = getApp()

Page({
  data: {
    t:"hwllo"
  },
  onLoad: function(){
    var that = this;
    wx.request(
      {
        url:"http://127.0.0.1/SM/select_alluser.php",
        headers:{
          'content-type':'application/json'
        },
        method:'GET',
        success:res=>{
          that.setData({
            t:res.data
          })
        }
      }
    );
  }
})

wxml代码：

{{item.username}}
{{item.password}}

后台返回的数据：