转自：http://www.jb51.net/article/80679.htm
背景
在微信分享开发的时候我们通常的流程是
<?php
require_once
"jssdk.php";
$jssdk
= new
JSSDK("yourAppID",
"yourAppSecret");
$signPackage
= $jssdk->GetSignPackage();
?>
<!DOCTYPE
html>
<html
lang="en">
<head>
<meta
charset="UTF-8">
<title>微信分享</title>
</head>
<body>
</body>
<script>
wx.config({
appId:
'<?php
echo $signPackage["appId"];?>',
timestamp:
<?php echo
$signPackage["timestamp"];?>,
nonceStr:
'<?php
echo $signPackage["nonceStr"];?>',
signature:
'<?php
echo $signPackage["signature"];?>',
jsApiList:
['onMenuShareTimeline'
'onMenuShareAppMessage'
]
});
wx.ready(function()
{
wx.onMenuShareTimeline({
title:
'',
//
分享标题
link:
'',
//
分享链接
imgUrl:
'',
//
分享图标
success:
function()
{
//
用户确认分享后执行的回调函数
},
cancel:
function()
{
//
用户取消分享后执行的回调函数
}
});
wx.onMenuShareAppMessage({
title:
'',
//
分享标题
desc:
'',
//
分享描述
link:
'',
//
分享链接
imgUrl:
'',
//
分享图标
type:
'',
//
分享类型,music、video或link，不填默认为link
dataUrl:
'',
//
如果type是music或video，则要提供数据链接，默认为空
success:
function()
{
//
用户确认分享后执行的回调函数
},
cancel:
function()
{
//
用户取消分享后执行的回调函数
}
});
});
</script>
</html>
上面是一个php文件，这样的代码的一个很大缺点是前后端未分离耦合度太高，再一就是混合写不是很美观，所以我们要让PHP和HTML分离，要实现分享功能，首先就是要调用用微信的jssdk Api获取到配置参数， 这个必须是要通过php后台语言来获取的，然后将这些参数配置于wx.config中，在wx.config之前要先引入http://res.wx.qq.com/open/js/jweixin-1.0.0.js然后就可以写分享的函数了，他们的依赖关系是wx.config
需要js库和config内部的参数，分享依赖wx.config
所以最重要的就把php的配置参数分离出来单独获取即可
解决方案
将获取配置参数的PHP写作为接口，在js里使用ajax调用，获取参数并转换为对象，再通过回调函数将ajax获取的参数塞到wx.config中
代码结构及功能
- index.html 页面入口
- weixin.php 服务器端获取配置参数
- configdata.php将配置转为借口输出
- getconfig.js 用ajax获取configdata.php的数据
- share.js 分享回调函
- webpack.config.js webpack配置文件
- index.js 打包后最终html调用js文件
index.html html静态文件
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<!DOCTYPE
html>
<htmllang="en">
<head>
<metacharset="UTF-8">
<title>静态页面微信分享测试</title>
</head>
<body>
<scriptsrc="statics/js/index.js"></script>
</body>
</html>
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configdata.php 后台获取配置的参数注意url要写上自己被分享的页面url不然会报invalid signature错误
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<?php
classJSSDK
{
private$appId;
private$appSecret;
publicfunction
__construct($appId,$appSecret)
{
$this->appId
= $appId;
$this->appSecret
= $appSecret;
}
publicfunction
getSignPackage() {
$jsapiTicket=
$this->getJsApiTicket();
$timestamp=
time();
$nonceStr=
$this->createNonceStr();
//
这里参数的顺序要按照 key 值 ASCII 码升序排序
$string=
"jsapi_ticket=$jsapiTicket&noncestr=$nonceStr×tamp=$timestamp&url=$url";
$signature=
sha1($string);
$signPackage=
array(
"appId"=>
$this->appId,
"nonceStr"=>
$nonceStr,
"timestamp"=>
$timestamp,
"url"=>
$url,
"signature"=>
$signature,
"rawString"=>
$string
);
return$signPackage;
}
privatefunction
createNonceStr($length=
16) {
$chars=
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
$str=
"";
for($i=
0; $i<
$length;$i++)
{
$str.=
substr($chars,
mt_rand(0, strlen($chars)
- 1), 1);
}
return$str;
}
privatefunction
getJsApiTicket() {
//
jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
$data=
json_decode(file_get_contents("jsapi_ticket.json"));
if($data->expire_time
< time()) {
$accessToken=
$this->getAccessToken();
$res=
json_decode($this->httpGet($url));
$ticket=
$res->ticket;
if($ticket)
{
$data->expire_time
= time() + 7000;
$data->jsapi_ticket
= $ticket;
$fp=
fopen("jsapi_ticket.json","w");
fwrite($fp,
json_encode($data));
fclose($fp);
}
}else{
$ticket=
$data->jsapi_ticket;
}
return$ticket;
}
privatefunction
getAccessToken() {
//
access_token 应该全局存储与更新，以下代码以写入到文件中做示例
$data=
json_decode(file_get_contents("access_token.json"));
if($data->expire_time
< time()) {
$url=
"https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
$res=
json_decode($this->httpGet($url));
$access_token=
$res->access_token;
if($access_token)
{
$data->expire_time
= time() + 7000;
$data->access_token
= $access_token;
$fp=
fopen("access_token.json","w");
fwrite($fp,
json_encode($data));
fclose($fp);
}
}else{
$access_token=
$data->access_token;
}
return$access_token;
}
privatefunction
httpGet($url)
{
$curl=
curl_init();
curl_setopt($curl,
CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl,
CURLOPT_TIMEOUT, 500);
curl_setopt($curl,
CURLOPT_URL, $url);
$res=
curl_exec($curl);
curl_close($curl);
return$res;
}
}
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weixin.php 将配置参数格式化输出
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<?php
require_once"weixin.php";
$jssdk=
newJSSDK(appId,
appSecretecret);
$signPackage=
$jssdk->GetSignPackage();
classConfig{
var$appId;
var$timestamp;
var$nonceStr;
var$signature;
var$url;
}
$config=
newConfig();
$config->
appId = $signPackage["appId"];
$config->
timestamp = $signPackage["timestamp"];
$config->
nonceStr = $signPackage["nonceStr"];
$config->
signature = $signPackage["signature"];
$config->
url = $signPackage["url"];
echojson_encode($config);
?>
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getconfig.js 使用ajax获取接口数据（配置参数）
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vargetConfig
= function(callback)
{
$.ajax({
type:"get",
success:function(data)
{
callback(data);
}
})
}
module.exports
= getConfig;
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share.js 分享函数
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vargetWeixincofig
= require("./getconfig.js");
getWeixincofig(shareweixin);
functionshareweixin(data)
{
vardata
= JSON.parse(data);
console.log(data);
window.wx.config({
debug:true,
appId:
data.appId,
timestamp:
data.timestamp,
nonceStr:
data.nonceStr,
signature:
data.signature,
jsApiList:
['checkJsApi','onMenuShareTimeline','onMenuShareAppMessage']
});
wxShare();
}
functionwxShare()
{
//检测api是否生效
wx.ready(function()
{
wx.checkJsApi({
jsApiList:
[
'getNetworkType',
'previewImage'
],
success:function(res)
{
console.log(JSON.stringify(res));
}
});
//分享给好友
wx.onMenuShareAppMessage({
title:'趣学车-有温度的互联网驾校',
desc:'想去学车，就趣学车!',
});
//分享到朋友圈
wx.onMenuShareTimeline({
title:'趣学车-有温度的互联网驾校',
desc:'想去学车，就趣学车!',
});
});
}
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webpack.config.js
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varwebpack
= require('webpack');
module.exports
= {
entry:
{
index:'./share.js',
},
output:
{
path:'./',
filename:'[name].js'
}
};
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以上就是本文的全部内容，希望对大家的学习有所帮助。