微信(weixin)分享网页自定义缩略图、链接、标题和摘要

由于微信分享是通过WeixinJSBridge实现的。所以用户只需要将下面这段Js代码复制到网页中，定义好对应的参数即可

  var imgUrl = 'https://saycn.net/xxx.jpg';
        var lineLink = 'https://saycn.net/904';
        var descContent = "这是xxx的博客";
        var shareTitle = 'xxx';
        var appid = '';
        
        function shareFriend() {
            WeixinJSBridge.invoke('sendAppMessage',{
                "appid": appid,
                "img_url": imgUrl,
                "img_width": "200",
                "img_height": "200",
                "link": lineLink,
                "desc": descContent,
                "title": shareTitle
            }, function(res) {
                //_report('send_msg', res.err_msg);
            })
        }
        function shareTimeline() {
            WeixinJSBridge.invoke('shareTimeline',{
                "img_url": imgUrl,
                "img_width": "200",
                "img_height": "200",
                "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);