js在不同模块间传递数据

之前的项目中,从A页面跳转到B页面,或者从A模块跳转到B模块的时候,如果需要传递数据,一般会使用sessStorage或者localStorage来传数据,一下方法对这个操作进行了封装; 
  window.app = {
        setItem: function(app_key,value){
            if(typeof app_key != "string")return false; //第一个参数必须是字符串
            if(typeof value === "object"){ //第二个参数如果是对象就转成字符串
                value = "object" + JSON.stringify(value);
            }
            localStorage.setItem(app_key,app_key);  //把key存到localStorage
            var app_value = app_key + "V"
            localStorage.setItem(app_value,value);  //把value存到localStorage
        },
        getItem: function(app_key){
            if(localStorage[app_key] == app_key){ //比对传进的参数是否
                                                  //跟localStorage中的key相同
                var app_value = app_key + "V";
                var value = localStorage[app_value];
                if(value.substr(0,6) === "object"){
                    var valueStr = value.substr(6);
                    value = JSON.parse(valueStr);
                }
                localStorage.removeItem(app_key);    //删除localStorage中对应的
                localStorage.removeItem(app_value);  //key和value也是说一存一取
                return value;                        //取完就删掉如果你要一存多取
            }                                        //请直接使用localStorage
        }                      
    }