数组/对象奇怪的行为

Question

关注Javascript：

WORKING

            //Going to set on local storage on an iPhone
            window.localStorage.setItem("emailaddress", "test@test.de");
            //Loading local storage
            var storage = window.localStorage.getItem("emailaddress");
            alert(storage); //test@test.de 
            var servicename = "test";
            window.plugins.keychain.getForKey(storage, servicename);

不工作

            //Going to set on local storage on an iPhone
            window.localStorage.setItem("emailaddress", "test@test.de" + ":1");
            //Loading local storage
            var storage = window.localStorage.getItem("emailaddress");
            var array = new Array();
            var array = storage.split(":");
            var emailaddress = array[0];
            alert(emailaddress); //test@test.de
            var servicename = "test";
            window.plugins.keychain.getForKey(emailaddress, servicename);

为什么呢？实际上我需要第二个，因为我想存储多个电子邮件地址，例如emailaddress / state / timestamp ....