WeChat JSAPI

The website has free download sample code includes old APIs and JSAPI.
http://binsee.github.io/wechat-php-sdk/2015/%E5%85%B3%E4%BA%8E%E5%BE%AE%E4%BF%A1JSAPI%E5%88%86%E4%BA%AB%E4%B8%8D%E8%83%BD%E4%BD%BF%E7%94%A8%E7%9A%84%E7%96%91%E9%97%AE%E8%A7%A3%E5%86%B3/

For JSAPI debug using, set
1.   wx.config({
      debug: true,
2. For chrome, open log view by pressing ctrl + shift + j.

• Use the keyboard shortcut Command + Option + J (Mac) or Control + Shift + J (Windows/Linux).
• Select  > More Tools > JavaScript Console.

3. Put the sample code on your website and put the link in wechat service page.
   Then will get Token and ticket to access it.
4. For access device via JSAPI, need to send mail to wxthings@foxmail.com to request open the authorization but not for test account. You should have real service account.
5. Compatible old version, add the code http://blog.csdn.net/snow_finland/article/details/43228839.

official wiki:
http://qydev.weixin.qq.com/wiki/index.php?title=%E5%BE%AE%E4%BF%A1JS%E6%8E%A5%E5%8F%A3

http://admin.wechat.com/wiki/index.php?title=JS_SDK_DOCUMENT (English)