小程序的下拉刷新與上劃加載

1.獲取頁面的值

手機端頁面使用如下代碼:
<view class="list"  wx:for="{{list}}" wx:for-item="item"  data-title="{{item.address}}" bindtap="toDetail" data-index="{{item.id}}">
<image class="avatar" src="{{item.avatar}}" ></image>
<view  class="eee" > 
<view style="margin:5px;font-size:12px"> 姓名:{{item.name}}</view>
<view style="margin:5px;font-size:12px"> 作物:{{item.crop}}</view>
<view style="margin:5px;color:red;font-size:12px"> 類型:{{item.operation_type}}</view>
</view>
</view>
在JS中使用如下代碼獲取頁面值:
toDetail: function(event){
var objectId=event.currentTarget.dataset.index;
console.log(objectId);
wx.navigateTo({
url: '../../pages/gro/detail'
})
}
手機端如果使用如下單個:
<view bindtap="toDetail" data-id="aaa">點擊事件</view>
在JS中使用如下代碼獲取頁面值:
toDetail: function(event){
var objectId=event.target.dataset.id;
console.log(objectId);
wx.navigateTo({
url: '../../pages/gro/detail'
})
}
2.頁面刷新

手機端頁面代碼:

<!--pages/grower/list.wxml-->
<loading hidden="{{hidden}}" bindchange="loadingChange">
加載中...
</loading>


<scroll-view scroll-y="true" style="height: 830px;" bindscrolltolower="loadMore" bindscrolltoupper="refesh" upper-threshold="0" lower-threshold="0">
<view wx:if="{{hasRefesh}}" style="display: flex;flex-direction: row;align-items: center;align-self: center;justify-content: center;"  >
<icon type="waiting" size="30"/><text>刷新中...</text>
</view>
<view wx:else  style="display:none" >
<text>沒有更多內容了</text>
</view>
<view class="list"  wx:for="{{list}}" wx:for-item="item"  data-title="{{item.address}}" bindtap="toDetail" data-index="888">
<image class="avatar" src="{{item.avatar}}" ></image>
<view  class="eee" > 
<view style="margin:5px;font-size:12px"> 姓名:{{item.name}}</view>
<view style="margin:5px;font-size:12px"> 作物:{{item.crop}}</view>
<view style="margin:5px;color:red;font-size:12px"> 類型:{{item.operation_type}}</view>
</view>
</view>


<view class="tips1">
<view wx:if="{{hasMore}}" style="display: flex;flex-direction: row;align-items: center;align-self: center;justify-content: center;">
<icon type="waiting" size="30"/><text>玩命的加載中...</text></view>
<view wx:else><text>沒有更多內容了</text></view>
</view>
</scroll-view>


/* pages/grower/list.wxss */
.list {
display: flex; 
  flex-direction: row;
  align-items: stretch;
  height: 80px;
} 


.eee {
  display: flex;
 flex-direction: column;
 align-items: flex-start;
 height: 80px;
} 


.tips1{
  height: 60px;
}


.avatar {
 width: 128rpx;
 height: 128rpx;
 margin: 20rpx;
 border-radius: 50%;
}


/* pages/grower/list.json */
{
"navigationBarTitleText": "我是種植戶"
}


// pages/grower/list.js


var network_util = require('../../utils/network_util.js');


Page({
 data:{
list:[],
hidden:false,
page: 1,
size: 5,
hasMore:true,
hasRefesh:false
 },
 onLoad:function(options){
// 頁面初始化 options爲頁面跳轉所帶來的參數
var that = this;
var url = 'http://127.0.0.1:8080/njb-api/dudriver/query.do';
network_util._get(url,
function(res){
that.setData({
list:res.data.drivers,
hidden: true,
});
},function(res){
 console.log(res);
});


 },
 onReady:function(){
// 頁面渲染完成
 },
 onShow:function(){
// 頁面顯示
 },
 onHide:function(){
// 頁面隱藏
 },
 onUnload:function(){
// 頁面關閉
 },


 loadMore: function(e) {
var that = this;
that.setData({
hasRefesh:true
});
if (!this.data.hasMore) return
var url = 'http://127.0.0.1:8080/njb-api/dudriver/query.do?page='+(++that.data.page);
network_util._get(url,
function(res){
that.setData({
  list: that.data.list.concat(res.data.drivers),
  hidden: true,
  hasRefesh:false,
});
},function(res){
console.log(res);
 })
},


refesh: function(e) {
var that = this;
that.setData({
hasRefesh:true,
});
var url = 'http://127.0.0.1:8080/njb-api/dudriver/query.do?page=1';
network_util._get(url,
function(res){
that.setData({
 list:res.data.drivers,
  hidden: true,
  page:1,
  hasRefesh:false,
});
},function(res){
console.log(res);
})
 },


 toDetail: function(event){
var objectId=event.currentTarget.dataset.index;
 console.log(objectId);
wx.navigateTo({
 url: '../../pages/grower/detail'
})
 }


})


// utils/util.js

var md5 = require('md5.js');


function formatTime(date) {
 var year = date.getFullYear()
 var month = date.getMonth() + 1
 var day = date.getDate()


 var hour = date.getHours()
 var minute = date.getMinutes()
 var second = date.getSeconds()


 return [year, month, day].map(formatNumber).join('/') + ' ' + [hour, minute, second].map(formatNumber).join(':')
}


function formatNumber(n) {
 n = n.toString()
 return n[1] ? n : '0' + n
}


function getNowFormatDate() {
var date = new Date();
var seperator1 = "-";
var seperator2 = ":";
var month = date.getMonth() + 1;
var strDate = date.getDate();
if (month >= 1 && month <= 9) {
month = "0" + month;
}
if (strDate >= 0 && strDate <= 9) {
strDate = "0" + strDate;
}
var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate
+ " " + date.getHours() + seperator2 + date.getMinutes()
+ seperator2 + date.getSeconds();
return currentdate;
}




//獲取Token
function getToken(time) {
 var token = time + getPswId();
 console.log(token);
  return md5.hex_md5(token);
}


function getKo(){
 return '0000';
}


function getTime(){
 return getNowFormatDate();
}


function getPswId(){
 return '0010000app';
}




function tokenAndKo(map){
 let time = getTime();
 map.set('ko',getKo());
 map.set('time',time);
 map.set('token',getToken(time));
 return map;
}




module.exports = {
 formatTime: formatTime,
 getToken:getToken,
 getKo:getKo,
 getTime:getTime,
 getPswId,getPswId,
 tokenAndKo,tokenAndKo,
}



// utils/md5.js

var hexcase = 0;  
var b64pad  = ""; 
var chrsz   = 8;  
function hex_md5(s){ return binl2hex(core_md5(str2binl(s), s.length * chrsz));}
function b64_md5(s){ return binl2b64(core_md5(str2binl(s), s.length * chrsz));}
function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); }
function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); }
function calcMD5(s){ return binl2hex(core_md5(str2binl(s), s.length * chrsz));}


function md5_vm_test()
{
 return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
}


function core_md5(x, len)
{


 x[len >> 5] |= 0x80 << ((len) % 32);
 x[(((len + 64) >>> 9) << 4) + 14] = len;
 var a =  1732584193;
 var b = -271733879;
 var c = -1732584194;
 var d =  271733878;
 for(var i = 0; i < x.length; i += 16)
 {
var olda = a;
var oldb = b;
var oldc = c;
var oldd = d;


a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
c = md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);
b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
d = md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);
c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
a = md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
a = md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);
d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
b = md5_ff(b, c, d, a, x[i+15], 22,  1236535329);
a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
c = md5_gg(c, d, a, b, x[i+11], 14,  643717713);
b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
d = md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);
c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
a = md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
b = md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);
a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
c = md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);
b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);
a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
c = md5_hh(c, d, a, b, x[i+11], 16,  1839030562);
b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
d = md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);
c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
a = md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);
d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
b = md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);
a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
c = md5_hh(c, d, a, b, x[i+15], 16,  530742520);
b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);
a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
d = md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);
c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
a = md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);
d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
a = md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
b = md5_ii(b, c, d, a, x[i+13], 21,  1309151649);
a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
c = md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);
b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);


a = safe_add(a, olda);
b = safe_add(b, oldb);
c = safe_add(c, oldc);
d = safe_add(d, oldd);
 }
 return Array(a, b, c, d);
 
}


function md5_cmn(q, a, b, x, s, t)
{
 return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
}
function md5_ff(a, b, c, d, x, s, t)
{
 return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
function md5_gg(a, b, c, d, x, s, t)
{
 return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
function md5_hh(a, b, c, d, x, s, t)
{
 return md5_cmn(b ^ c ^ d, a, b, x, s, t);
}
function md5_ii(a, b, c, d, x, s, t)
{
 return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
}


function core_hmac_md5(key, data)
{
 var bkey = str2binl(key);
 if(bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);


 var ipad = Array(16), opad = Array(16);
 for(var i = 0; i < 16; i++) 
 {
ipad[i] = bkey[i] ^ 0x36363636;
opad[i] = bkey[i] ^ 0x5C5C5C5C;
 }


 var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
 return core_md5(opad.concat(hash), 512 + 128);
}


function safe_add(x, y)
{
 var lsw = (x & 0xFFFF) + (y & 0xFFFF);
 var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
 return (msw << 16) | (lsw & 0xFFFF);
}


function bit_rol(num, cnt)
{
 return (num << cnt) | (num >>> (32 - cnt));
}


function str2binl(str)
{
 var bin = Array();
 var mask = (1 << chrsz) - 1;
 for(var i = 0; i < str.length * chrsz; i += chrsz)
bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (i%32);
 return bin;
}


function binl2hex(binarray)
{
 var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
 var str = "";
 for(var i = 0; i < binarray.length * 4; i++)
 {
str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +
  hex_tab.charAt((binarray[i>>2] >> ((i%4)*8  )) & 0xF);
 }
 return str;
}


function binl2b64(binarray)
{
 var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 var str = "";
 for(var i = 0; i < binarray.length * 4; i += 3)
 {
var triplet = (((binarray[i   >> 2] >> 8 * ( i   %4)) & 0xFF) << 16)
| (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )
|  ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);
for(var j = 0; j < 4; j++)
{
 if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;
 else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
}
 }
 return str;
}


module.exports = {
hex_md5:hex_md5,
}



// utils/network_util.js

import util from 'util.js';
/**
* url 請求地址
* success 成功的回調
* fail 失敗的回調
*/
function _get( url, success, fail ) {


console.log( "------start---_get----" );
wx.request( {
url: url,
header: {
// 'Content-Type': 'application/json'
},
success: function( res ) {
success( res );
},
fail: function( res ) {
fail( res );
}
});


console.log( "----end-----_get----" );
}


/**
* url 請求地址
* success 成功的回調
* fail 失敗的回調
*/
function _post(url,data, success, fail ) {
console.log( "----_post--start-------" );
wx.request( {
url: url,
header: {
'content-type': 'application/x-www-form-urlencoded',
},
method:'POST',
data:{data: data},
success: function( res ) {
success( res );
},
fail: function( res ) {
fail( res );
}
});
console.log( "----end-----_get----" );
}




/**
* url 請求地址
* success 成功的回調
* fail 失敗的回調
*/
function _post1(url,data, success, fail ) {
console.log( "----_post--start-------" );
wx.request( {
url: url,
header: {
'content-type': 'application/x-www-form-urlencoded',
},
method:'POST',
data:data,
success: function( res ) {
success( res );
},
fail: function( res ) {
fail( res );
}
});
console.log( "----end-----_get----" );
}


/**
* url 請求地址
* success 成功的回調
* fail 失敗的回調
*/
function _post_json(url,data, success, fail ) {
console.log( "----_post--start-------" );
wx.request( {
url: url,
// header: {
//     'content-type': 'application/json',
// },
method:'POST',
data:data,
success: function( res ) {
success( res );
},
fail: function( res ) {
fail( res );
}
});

console.log( "----end----_post-----" );
}
module.exports = {
_get: _get,
_post:_post,
_post1:_post1,
_post_json:_post_json
}



// utils/json_util.js

/**
 *
 * json轉字符串
 */
 function stringToJson(data){
return JSON.parse(data);
 }
 /**
 *字符串轉json
 */
 function jsonToString(data){
return JSON.stringify(data);
 }
 /**
 *map轉換爲json
 */
 function mapToJson(map) {
 return JSON.stringify(strMapToObj(map));
 }
 /**
 *json轉換爲map
 */
 function jsonToMap(jsonStr){
return  objToStrMap(JSON.parse(jsonStr));
 }




/**
*map轉化爲對象（map所有鍵都是字符串，可以將其轉換爲對象）
*/
function strMapToObj(strMap){
let obj= Object.create(null);
for (let[k,v] of strMap) {
 obj[k] = v;
}
return obj;
 }


/**
*對象轉換爲Map
*/
function  objToStrMap(obj){
 let strMap = new Map();
 for (let k of Object.keys(obj)) {
strMap.set(k,obj[k]);
 }
 return strMap;
}


module.exports = {
stringToJson: stringToJson,
jsonToString:jsonToString,
mapToJson:mapToJson,
jsonToMap:jsonToMap,
strMapToObj:strMapToObj,
objToStrMap:objToStrMap,
}