[js高手之路] 跟GhostWu一起封装一个字符串工具库-扩展camelize与dasherize方法(3)

在此之前，我们已经完成了4个方法:

trimLeft, trimRight, trim, capitalize

本文，我们扩展驼峰式与下划线转化这两个对称的方法

camelize: 把空格，下划线，中横线后面的首字母大写.

dasherize: 把空格后面的大写字母，大写字母，下划线后面的大写字母，变成  中横线 + 对应的小写字母:

如: MozBorderRadius 变成 -moz-border-radius

 ; (function (window, undefined) {
     function init(obj, s) {
         if (s !== null && s !== undefined) {
             if (typeof s === 'string') {
                 obj.s = s;
             } else {
                 obj.s = s.toString();
             }
         } else {
             obj.s = s;
         }
     }

     function G(s) {
         init(this, s);
     }

     function GhostWu(s) {
         return new G(s);
     }

     var sProto = String.prototype;
     G.prototype = {
         constructor: G,
         capitalize: function () {
             return new this.constructor(this.s.slice(0, 1).toUpperCase() + this.s.substring(1).toLowerCase());
         },
         trimLeft: function () {
             var s;
             if (sProto.trimLeft === 'undefined')
                 s = this.s.trimLeft();
             else
                 s = this.s.replace(/^\s+/g, '');
             return new this.constructor(s);
         },
         trimRight: function () {
             var s;
             if (sProto.trimRight === 'undefined')
                 s = this.s.trimRight();
             else
                 s = this.s.replace(/\s+$/g, '');
             return new this.constructor(s);
         },
         trim: function () {
             var s;
             if (typeof sProto.trim === 'undefined') {
                 s = this.s.replace(/^\s+|\s+$/g, '');
             } else {
                 s = this.s.trim();
             }
             return new this.constructor(s);
         },
         camelize : function () {
             var s = this.trim().s.replace(/(\-|_|\s)+(.)?/g, function ( s0, s1, s2 ) {
                 return ( s2 ? s2.toUpperCase() : '' );
             });
             return new this.constructor(s);
         },
         dasherize : function(){
             var s = this.trim().s.replace(/[_\s]+/g, '-').replace(/([A-Z])/g, '-$1').replace(/-+/g, '-').toLowerCase();
             return new this.constructor(s);
         }
     };

     window.G = GhostWu;
 })(window, undefined);

console.log( G( 'ghost wu tell you how to learn js').camelize().s );//ghostWuTellYouHowToLearnJs

console.log( G( 'ghost-wu-tell you how to learn js').camelize().s );//ghostWuTellYouHowToLearnJs

console.log( G( 'ghost_wu_tell you how to learn js').camelize().s );//ghostWuTellYouHowToLearnJs

console.log( G( '-moz-border-radius' ).camelize().s );//MozBorderRadius

console.log( G( 'MozBorderRadius' ).dasherize().s ); //-moz-border-radius

console.log( G( 'backgroundColor' ).dasherize().s ); //background-color

console.log( G( 'background color' ).dasherize().s ); //background-color