微信文档 ，https://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps/JS-SDK.html，

在用微信自定义分享，遇到了几个坑，记录一下。

注意点1：进入“公众号设置”的“功能设置”里填写“JS接口安全域名”。注意公众号需要认证，否则可能提示使用接口 没有权限；

注意点2：access_token是公众号的全局唯一接口调用凭据，有效时间2小时，注意缓存，不能每次都获取新的，次数一天2000次，可以缓存，或者存入数据表，用时判断当前时间和存入的时间差。实在超过，可在微信后台 接口权限中清空次数，一个月只能清3次。

其中的jsapi_ticket也是，缓存或者存表。

注意点3： 签名的注意事项

注意点4：签名时的url, 在pc的微信中，url没有拼接什么，而在手机的微信中，会在你当前页面上自动拼接上朋友圈 from=timeline，微信群 from=groupmessage，好友分享 from=singlemessage，签名时要注意，不要漏掉，可以在前台ajax请求时，或者当前页面的url,传入后台签名。

注意点5：

在手机微信中这些接口确实已经废弃，用了，就会提示不支持，而在pc微信中，还是用这些，不能用新的

由于pc和手机使用的方法不同，在php中定义了两套，用手机打开时访问一套，pc打开时访问一套，或者弄访问地址完全不一样的页面，pc一个地址，手机一个地址

下面是php中的定义，手机和pc虽然是同一个网址，但是真正访问的还是两套

function is_mobile(){
$user_agent = $_SERVER['HTTP_USER_AGENT'];

$mobile\_agents = Array("240x320","acer","acoon","acs-","abacho","ahong","airness","alcatel","amoi","android","anywhereyougo.com","applewebkit/525","applewebkit/532","asus","audio","au-mic","avantogo","becker","benq","bilbo","bird","blackberry","blazer","bleu","cdm-","compal","coolpad","danger","dbtel","dopod","elaine","eric","etouch","fly ","fly\_","fly-","go.web","goodaccess","gradiente","grundig","haier","hedy","hitachi","htc","huawei","hutchison","inno","ipad","ipaq","ipod","jbrowser","kddi","kgt","kwc","lenovo","lg ","lg2","lg3","lg4","lg5","lg7","lg8","lg9","lg-","lge-","lge9","longcos","maemo","mercator","meridian","micromax","midp","mini","mitsu","mmm","mmp","mobi","mot-","moto","nec-","netfront","newgen","nexian","nf-browser","nintendo","nitro","nokia","nook","novarra","obigo","palm","panasonic","pantech","philips","phone","pg-","playstation","pocket","pt-","qc-","qtek","rover","sagem","sama","samu","sanyo","samsung","sch-","scooter","sec-","sendo","sgh-","sharp","siemens","sie-","softbank","sony","spice","sprint","spv","symbian","tablet","talkabout","tcl-","teleca","telit","tianyu","tim-","toshiba","tsm","up.browser","utec","utstar","verykool","virgin","vk-","voda","voxtel","vx","wap","wellco","wig browser","wii","windows ce","wireless","xda","xde","zte");  
$is\_mobile = false;  
foreach ($mobile\_agents as $device) {//这里把值遍历一遍，用于查找是否有上述字符串出现过  
    if (stristr($user\_agent, $device)) { //stristr 查找访客端信息是否在上述数组中，不存在即为PC端。  
        $is\_mobile = true;  
        break;  
    }  
}  
return $is\_mobile;  

}

if(is_mobile()){ //跳转至wap分组
define('BIND_MODULE','Mobile');
}else{
define('BIND_MODULE','Home');
}

判断access_token 过期，我这只是2000秒，远远不到7200秒（2小时），

time字段设置为了默认值当前时间

$access_time = M("dc_weixin")->order("id desc")->getField("time");
$time = time() - strtotime($access_time);
if($time>2000){
$url="https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$this->app_id."&secret=".$this->app_secret;
$content = file_get_contents($url);
$result = json_decode($content);
$data['access_token'] = $result->access_token;
$weixin = M("dc_weixin")->data($data)->add();
}

　　//jsapi_ticket

public function getJk(){
$this->getToken();
$access_token = M("dc_weixin")->order("id desc")->getField("access_token");

    $jk\_time = M("dc\_jk")->order("id desc")->getField("time");  
    $time = time() - strtotime($jk\_time);  
    if($time>2000){  
        $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access\_token=".$access\_token."&type=jsapi";  
        $content = file\_get\_contents($url);  
        $result = json\_decode($content);  
        $data\['jk'\] = $result->ticket;  
        $weixin = M("dc\_jk")->data($data)->add();  
    }

}

/*
* 随机字符串
*/
function create_guid() {
$charid = strtoupper(md5(uniqid(mt_rand(), true)));
$hyphen = chr(45);// "-"
$uuid =
substr($charid, 0, 8).$hyphen
.substr($charid, 8, 4).$hyphen
.substr($charid,12, 4).$hyphen;
return str_replace("-","",$uuid);
}

//签名   页面里ajax访问，签名的方法

public function dcsign_mob(){

    $html = $\_SERVER\['HTTP\_REFERER'\];  
    $time = strtotime(date('Y-m-d H:i:s',time()));  
    $nostr = $this->create\_guid();  
    $jk=  M("dc\_jk")->order("id desc")->getField("jk");

    $url  =  "jsapi\_ticket=".$jk."&noncestr=".$nostr."&timestamp=".$time."&url=".$html;  
    $signature = sha1($url);

    $data\['html'\] = $html;  
    $data\['time'\] = $time;  
    $data\['nostr'\] = $nostr;  
    $data\['signature'\] = $signature;  
    $this->ajaxReturn($data); //返回到html也中  
}

$.ajax({
url: "{:U('**/**')}",
type: "get",
//data:{} //这里没有将页面的url传入签名方法中，
timeout: 20000, //超时时间设置，单位毫秒
success: function (data) {

            console.log(data);

            wx.config({  
                debug: true, // 开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印。  
                appId: '\*\*\*\*\*', // 必填，公众号的唯一标识  
                timestamp: data.time, // 必填，生成签名的时间戳  
                nonceStr: data.nostr, // 必填，生成签名的随机串  
                signature: data.signature,// 必填，签名  
                jsApiList: \[ 'checkJsApi',  
                    'onMenuShareTimeline','onMenuShareAppMessage','updateAppMessageShareData','updateTimelineShareData'\] // 必填，需要使用的JS接口列表  
            });

            wx.ready(function() {

                wx.updateAppMessageShareData({  
                    title: shareTitle, // 分享标题  
                    desc: descContent, // 分享描述  
                    link: lineLink, // 分享链接，该链接域名或路径必须与当前页面对应的公众号JS安全域名一致  
                    imgUrl: 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.updateTimelineShareData({  
                    title: shareTitle, // 分享标题  
                    desc: descContent, // 分享描述  
                    link: lineLink, // 分享链接，该链接域名或路径必须与当前页面对应的公众号JS安全域名一致  
                    imgUrl: 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  
                    }  
                });

            });

        },  
        error: function (xhr, textStatus, errorThrown) {  
            /\*错误信息处理\*/  
            alert("进入error---");  
            alert("状态码："+xhr.status);  
            alert("状态:"+xhr.readyState);//当前状态,0-未初始化，1-正在载入，2-已经载入，3-数据进行交互，4-完成。  
            alert("错误信息:"+xhr.statusText );  
            alert("返回响应信息："+xhr.responseText );//这里是详细的信息  
            alert("请求状态："+textStatus);  
            alert(errorThrown);  
            alert("请求失败");  
        },  
        complete: function (XMLHttpRequest, status) {  
            if (status == 'timeout') {  
                layer.msg("请求超时，请稍后再试！");  
                layer.close(index);  
            }  
        }  
    });