How to set the title, thumbnail, link and description of WeChat sharing_javascript skills

<script> 
var imgUrl = 'http://topic.xcar.com.cn/201403/ad_q3/pic/banner.jpg'; 
var lineLink = 'http://topic.xcar.com.cn/201403/ad_q3/index.php'; 
var descContent = "http://topic.xcar.com.cn/201403/ad_q3/index.php"; 
var shareTitle = '【奥迪Q3开启尊享礼遇季】报名试驾，赢取精美礼品'; 
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>