用面向对象的编程方式写JavaScript

MyTool = new function() {/** * 返回非空字符串,如果有默认值就返回默认字符串. */this.notNull = function(str, defaultStr) {if (typeof (str) == "undefined" || str == null || str == '') {if (defaultStr)return defaultStr;elsereturn '';} else {return str;}}}rootId = MyTool.notNull(rootId, '001000');