[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