app.js

//app.js
App({
	onLaunch : function() {
		// 调用API从本地缓存中获取数据
		var logs = wx.getStorageSync('logs') || [];
		logs.unshift(Date.now());
		wx.setStorageSync('logs', logs);
	},
	getUserInfo : function(cb) {
		var that = this;
		if (this.globalData.userInfo) {
			typeof cb == "function" && cb(this.globalData.userInfo);
		} else {
			// 调用登录接口
			wx.login({
				success : function() {
					wx.getUserInfo({
						success : function(res) {
							that.globalData.userInfo = res.userInfo;
							typeof cb == "function"
									&& cb(that.globalData.userInfo);
						}
					});
				}
			});
		}
	},
	navigateTo :function(url){
		if (this.globalData.tabBar.indexOf(url) != -1) {
          	wx.switchTab({
		      url: url
		    });
        } else {
            wx.navigateTo({
	          url: url
	        });
        }
	},
	globalData : {
		userInfo : null,
		tabBar:["/pages/index/index","/pages/page/index","/pages/form/index"]
	}
});