定义分享时的缩略图、链接、标题、摘要确实是通过WeixinJSBridge实现的。

参考腾讯微生活的页面：（略去了跟此需求无关的代码，仅供参考）

<script> var imgUrl = 'http://qqfood.tc.qq.com/meishio/16/4585bf7c-be04-420f-ac8a-2dba61a7561f/0'; var lineLink = 'http://life.qq.com/weixin/r/lottery/13826036970196242008#wechat_redirect'; var descContent = "万达狂欢节, 夺宝幸运星大抽奖活动开始啦！"; var shareTitle = '万达狂欢节'; var appid = 'wxc9937e3a66af6dc8'; function shareFriend() {     WeixinJSBridge.invoke('sendAppMessage',{                             "appid": appid,                             "img_url": imgUrl,                             "img_width": "640",                             "img_height": "640",                             "link": lineLink,                             "desc": descContent,                             "title": shareTitle                             }, function(res) {                             _report('send_msg', res.err_msg);                             }) } function shareTimeline() {     WeixinJSBridge.invoke('shareTimeline',{                             "img_url": imgUrl,                             "img_width": "640",                             "img_height": "640",                             "link": lineLink,                             "desc": descContent,                             "title": shareTitle                             }, function(res) {                             _report('timeline', res.err_msg);                             }); } function shareWeibo() {     WeixinJSBridge.invoke('shareWeibo',{                             "content": descContent,                             "url": lineLink,                             }, function(res) {                             _report('weibo', res.err_msg);                             }); } // 当微信内置浏览器完成内部初始化后会触发WeixinJSBridgeReady事件。 document.addEventListener('WeixinJSBridgeReady', function onBridgeReady() {         // 发送给好友         WeixinJSBridge.on('menu:share:appmessage', function(argv){             shareFriend();             });         // 分享到朋友圈         WeixinJSBridge.on('menu:share:timeline', function(argv){             shareTimeline();             });         // 分享到微博         WeixinJSBridge.on('menu:share:weibo', function(argv){             shareWeibo();             });         }, false); </script>