设置微信自定义分享内容 

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/**
 * 设置微信自定义分享内容
 */
var config = {
  title: document.title,
  only_title: '',
  desc: '',
  imgUrl: 'share_wechat.jpg'
};
define(function () {
  return function weixin(config) {
    if(/micromessenger/i.test(navigator.userAgent)) {
      if(typeof requirejs == 'function') {
        requirejs(['//xxx/wechat/sdk/share.js'], function (weixinShare) {
          if(weixinShare && typeof weixinShare == 'function') {
            weixinShare({
              shareData: config
            });
          }
        });
      } else {
        var script = document.createElement('script');
        script.src = '//xxx/wechat/sdk/share.js';
        script.onload = function goShare() {
          if(window.weixinShare && typeof window.weixinShare == 'function') {
            window.weixinShare({
              shareData: config
            });
          }
        };
        document.body.appendChild(script);
      }
    }
  };
});