Node.js实现微信JS-SDK分享功能详解

function getWxSignature() { 
  $.ajax({ 
    url: "/activityWxShaer", 
    type: 'post', 
    data: { urlhref:location.href }, 
    success: function(jsons) { 
      var data = JSON.parse(jsons); 
      wx.config({ 
        debug: false, // 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: 'xxxxxxxxx', // 必填，公众号的唯一标识 
        timestamp: data.timestamp, // 必填，生成签名的时间戳 
        nonceStr: data.nonceStr, // 必填，生成签名的随机串 
        signature: data.signature, // 必填，签名，见附录1 
        jsApiList: [ 
            'onMenuShareTimeline', 
            'onMenuShareAppMessage', 
            'onMenuShareQQ', 
            'onMenuShareWeibo', 
            'onMenuShareQZone' 
          ] // 必填，需要使用的JS接口列表，所有JS接口列表见附录2 
      }); 
      shareFunc();// 微信的分享接口 里面为ready 
    } 
  }); 
} 

Express路由处理

/** 
 * 分享 
 */ 
router.post('/activityWxShaer', function(req, res, next) { 
  let hrefURL = req.body.urlhref; 
  wxShare.prototype.accessToken(hrefURL, function(data) { 
    res.json(data); 
  }); 
}); 

签名算法实现

/** 
   * 签名 
   * @param {*} url 
   */ 
  sign(url) { 
    let _this = this; 
    var ret = { 
      jsapi_ticket: configEnd.ticket, 
      nonceStr: configEnd.nonceStr, 
      timestamp: configEnd.timestamp, 
      url: url 
    }; 
    var string = _this.rawString(ret); 
    var shaObjs = sha1(string); 
    return shaObjs; 
  }; 

四、nodeJS后台代码直接上整体代码
[javascript] view plain copy
var url = require('url'); 
var request = require('request'); 
var sha1 = require('sha1'); 
 
let config = { 
    appID: "",// 微信公众号ID 
    appSecret: "" //微信公众号里有 
  }, 
  configEnd = { 
    appID: '', 
    access_token: '', 
    ticket: '', 
    timestamp: '', // 必填，生成签名的时间戳 
    nonceStr: '', // 必填，生成签名的随机串 
    signature: '', // 必填，签名，见附录1 
  }; 
 
/** 
 * 微信分享 
 */ 
class wxShare { 
  /** 
   * 请求获取access_token 方法入口 
   * @param {* URL链接} hrefURL 
   * @param {* 回调请求方法} callback 
   */ 
  accessToken(hrefURL, callback) { // 获取access_token 
    let _this = this; 
    var tokenUrl = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=' + config.appID + '&secret=' + config.appSecret; 
    request(tokenUrl, function(error, response, body) { 
      if (response.statusCode && response.statusCode === 200) { 
        body = JSON.parse(body); 
        configEnd.access_token = body.access_token; 
        _this.upJsapiTicket(hrefURL, body.access_token, callback) 
      } 
    }); 
  }; 
  /** 
   * 获取<span style="font-family:Arial;">Jsapi_Ticket</span> 
   * @param {* URL链接} hrefURL 
   * @param {* token} access_Ttoken 
   * @param {* 回调请求方法} callback 
   */ 
  upJsapiTicket(hrefURL, access_Ttoken, callback) { // Jsapi_ticket 
    let _this = this; 
    var ticketUrl = 'https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=' + access_Ttoken + '&type=jsapi'; 
    request(ticketUrl, function(err, response, content) { 
      content = JSON.parse(content); 
      if (content.errcode == 0) { 
        configEnd.ticket = content.ticket; // ticket 
        configEnd.timestamp = _this.createTimestamp(); // 时间戳 
        configEnd.nonceStr = _this.createNonceStr(); // 随机数 
        configEnd.signature = _this.sign(hrefURL); // 签名 
        callback && callback(configEnd); // 回调前端JS方法 
      } 
    }) 
  }; 
  /** 
   * 随机字符串 
   */ 
  createNonceStr() { 
    return Math.random().toString(36).substr(2, 15); 
  }; 
  /** 
   * 时间戳 
   */ 
  createTimestamp() { 
    return parseInt(new Date().getTime() / 1000).toString(); 
  }; 
  /** 
   * 拼接字符串 
   * @param {*} args 
   */ 
  rawString(args) { 
    var keys = Object.keys(args); 
    keys = keys.sort() 
    var newArgs = {}; 
    keys.forEach(function(key) { 
      newArgs[key.toLowerCase()] = args[key]; 
    }); 
    var string = ''; 
    for (var k in newArgs) { 
      string += '&' + k + '=' + newArgs[k]; 
    } 
    string = string.substr(1); 
    return string; 
  }; 
  /** 
   * 签名 
   * @param {*} url 
   */ 
  sign(url) { 
    let _this = this; 
    var ret = { 
      jsapi_ticket: configEnd.ticket, 
      nonceStr: configEnd.nonceStr, 
      timestamp: configEnd.timestamp, 
      url: url 
    }; 
    var string = _this.rawString(ret); 
    var shaObjs = sha1(string); 
    return shaObjs; 
  }; 
 
} 
module.exports = wxShare;