如何自定义微信分享的内容：

1、引入微信官方的库：

<script type="text/javascript" src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>

2、自定义分享内容：

var WXShare={
  init:function(){
    $.post("微信分享信息的接口（返回微信appid之类微信分享需要用到的账户信息）",function(data){
      wx.config({
        debug: false,
        appId: data.appId,
        timestamp: data.timestamp,
        nonceStr: data.nonceStr,
        signature: data.signature,
        jsApiList: [
          'checkJsApi',
          'onMenuShareTimeline',
          'onMenuShareAppMessage',
          'onMenuShareQQ',
          'onMenuShareWeibo',
          'hideMenuItems',
          'showMenuItems',
          'hideAllNonBaseMenuItem'
        ]
      });
      wx.ready(function(){
        WXShare.share("描述","地址（绝对地址）","logo（绝对地址）");
      });
    },"json");
  }
  ,share:function(title,desc,link,pic){
    var wxData = {
      title: title,
      link: link,
      imgUrl: pic,
      desc: desc,
      success: function () {
        WXShare.end();
      },
      cancel: function () {
        WXShare.end();
      }
    }
    var wxDataTimeline = {
      title: desc,
      link: link,
      imgUrl: pic,
      success: function () {
        WXShare.end();
      },
      cancel: function () {
        WXShare.end();
      }
    }
    wx.onMenuShareTimeline(wxDataTimeline);
    wx.onMenuShareAppMessage(wxData);
    wx.onMenuShareQQ(wxData);
    wx.onMenuShareWeibo(wxData);
  },
  end:function(){
    stat("sharetowechat");
  }
};
WXShare.init();