function WeiXinShareBtn() {
if (typeof WeixinJSBridge == "undefined") {
alert("xxxxxxxxxxxxxxxxxxx，通過微信分享文章 ");
} else {
WeixinJSBridge.invoke('shareTimeline', {
"title": "xxx",
"link": "",
"desc": "xxxxxxxx",
"img_url": "assets/images/apple-touch-icon.png"
});
}
}