lunzi

封装了应用、继承、覆盖、扩展等基础操作。
jxoop.js
var Jxoop = {
    version: '1.0.0'
}
// for old browsers
window["undefined"] = window["undefined"];

//extend and override
Jxoop.apply = function(o, c, defaults) {
    if (defaults) {
        Jxoop.apply(o, defaults);
    }
    if (o && c && typeof c == 'object') {
        for (var p in c) {
            o<p> = c<p>;
        }
    }
    return o;
};

(function() {
    var idSeed = 0;
    var ua = navigator.userAgent.toLowerCase();
    var isStrict = document.compatMode == "CSS1Compat",
            isOpera = ua.indexOf("opera") > -1,
            isChrome = ua.indexOf("chrome") > -1,
            isSafari = !isChrome && (/webkit|khtml/).test(ua),
            isSafari3 = isSafari && ua.indexOf('webkit/5') != -1,
            isIE = !isOpera && ua.indexOf("msie") > -1,
            isIE7 = !isOpera && ua.indexOf("msie 7") > -1,
            isIE8 = !isOpera && ua.indexOf("msie 8") > -1,
            isGecko = !isSafari && !isChrome && ua.indexOf("gecko") > -1,
            isGecko3 = isGecko && ua.indexOf("rv:1.9") > -1,
            isBorderBox = isIE && !isStrict,
            isWindows = (ua.indexOf("windows") != -1 || ua.indexOf("win32") != -1),
            isMac = (ua.indexOf("macintosh") != -1 || ua.indexOf("mac os x") != -1),
            isAir = (ua.indexOf("adobeair") != -1),
            isLinux = (ua.indexOf("linux") != -1),
            isSecure = window.location.href.toLowerCase().indexOf("https") === 0;
    if (isIE && !isIE7) {
        try {
            document.execCommand("BackgroundImageCache", false, true);
        } catch(e) {
        }
    }
    Jxoop.apply(Jxoop, {
        scriptFragment: '(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)',
        emptyFn : function() {
        },
        defaultFn:function(p) {
            return p;
        },
        clazz: function() {
            return function() {
                (this.initialize || Jxoop.emptyFn).apply(this, arguments);
            }
        },
        extend : function(o, c) {
            if (o && c) {
                for (var p in c) {
                    if (typeof o<p> == "undefined") {
                        o<p> = c<p>;
                    }
                }
            }
            return o;
        },
        inherit : function() {
            var io = function(o) {
                for (var m in o) {
                    this[m] = o[m];
                }
            };
            var oc = Object.prototype.constructor;
            return function(sb, sp, overrides) {
                if (typeof sp == 'object') {
                    overrides = sp;
                    sp = sb;
                    sb = overrides.constructor != oc ? overrides.constructor : function() {
                        sp.apply(this, arguments);
                    };
                }
                var F = function() {
                }, sbp, spp = sp.prototype;
                F.prototype = spp;
                sbp = sb.prototype = new F();

                sbp.constructor = sb;
                sb.superclass = spp;

                if (spp.constructor == oc) {
                    spp.constructor = sp;
                }
                sb.override = function(o) {
                    Jxoop.override(sb, o);
                };
                sbp.override = io;
                Jxoop.override(sb, overrides);
                sb.inherit = function(o) {
                    Jxoop.inherit(sb, o);
                };
                return sb;
            };
        }(),
        override : function(origclass, overrides) {
            if (overrides) {
                var p = origclass.prototype;
                for (var method in overrides) {
                    p[method] = overrides[method];
                }
                if (Jxoop.isIE && overrides.toString != origclass.toString) {
                    p.toString = overrides.toString;
                }
            }
        },
        namespace : function() {
            var a = arguments, o = null, i, j, d, rt;
            for (i = 0; i < a.length; ++i) {
                d = a<i>.split(".");
                rt = d[0];
                eval('if (typeof ' + rt + ' == "undefined"){' + rt + ' = {};} o = ' + rt + ';');
                for (j = 1; j < d.length; ++j) {
                    o[d[j]] = o[d[j]] || {};
                    o = o[d[j]];
                }
            }
        },
        typeOf : function(o) {
            if (o === undefined || o === null) {
                return false;
            }
            if (o.htmlElement) {
                return 'element';
            }
            var t = typeof o;
            if (t == 'object' && o.nodeName) {
                switch (o.nodeType) {
                    case 1: return 'element';
                    case 3: return (/\S/).test(o.nodeValue) ? 'textnode' : 'whitespace';
                }
            }
            if (t == 'object' || t == 'function') {
                switch (o.constructor) {
                    case Array: return 'array';
                    case RegExp: return 'regexp';
                    case Date: return 'date';
                }
                if (typeof o.length == 'number' && typeof o.item == 'function') {
                    return 'nodelist';
                }
            }
            return t;
        },
        isEmpty : function(v, allowBlank) {
            return v === null || v === undefined || (!allowBlank ? v === '' : false);
        },
        nvl : function(v, defaultValue, allowBlank) {
            return Jxoop.isEmpty(v, allowBlank) ? defaultValue : v;
        },
        isArray : function(v) {
            return v && typeof v.length == 'number' && typeof v.splice == 'function';
        },

        isDate : function(v) {
            return v && typeof v.getFullYear == 'function';
        },

        isStrict : isStrict,
        isSecure : isSecure,
        isReady : false,
        enableGarbageCollector : true,
        enableListenerCollection:false,
        SSL_SECURE_URL : "javascript:false",
        isOpera : isOpera,
        isChrome : isChrome,
        isSafari : isSafari,
        isSafari3 : isSafari3,
        isSafari2 : isSafari && !isSafari3,
        isIE : isIE,
        isIE6 : isIE && !isIE7 && !isIE8,
        isIE7 : isIE7,
        isIE8 : isIE8,
        isGecko : isGecko,
        isGecko2 : isGecko && !isGecko3,
        isGecko3 : isGecko3,
        isBorderBox : isBorderBox,
        isLinux : isLinux,
        isWindows : isWindows,
        isMac : isMac,
        isAir : isAir,
        useShims : ((isIE && !isIE7) || (isMac && isGecko && !isGecko3))
    });

    Jxoop.ns = Jxoop.namespace;
})();

Jxoop.override(Function, {
    bind : function(obj, args, appendArgs) {
        var method = this;
        return function() {
            var callArgs = args || arguments;
            if (appendArgs === true) {
                callArgs = Array.prototype.slice.call(arguments, 0);
                callArgs = callArgs.concat(args);
            } else if (typeof appendArgs == "number") {
                callArgs = Array.prototype.slice.call(arguments, 0);
                var applyArgs = [appendArgs, 0].concat(args);
                Array.prototype.splice.apply(callArgs, applyArgs);
            }
            return method.apply(obj || window, callArgs);
        };
    },
    defer : function(millis, obj, args, appendArgs) {
        var fn = this.createDelegate(obj, args, appendArgs);
        if (millis) {
            return setTimeout(fn, millis);
        }
        fn();
        return 0;
    },
    createCallback : function() {
        var args = arguments;
        var method = this;
        return function() {
            return method.apply(window, args);
        };
    },
    createSequence : function(fcn, scope) {
        if (typeof fcn != "function") {
            return this;
        }
        var method = this;
        return function() {
            var retval = method.apply(this || window, arguments);
            fcn.apply(scope || this || window, arguments);
            return retval;
        };
    },
    createInterceptor : function(fcn, scope) {
        if (typeof fcn != "function") {
            return this;
        }
        var method = this;
        return function() {
            fcn.target = this;
            fcn.method = method;
            if (fcn.apply(scope || this || window, arguments) === false) {
                return;
            }
            return method.apply(this || window, arguments);
        };
    }
});

Jxoop.override(Number, {
    toColorPart: function() {
        var digits = this.toString(16);
        if (this < 16) return '0' + digits;
        return digits;
    },
    constrain : function(min, max) {
        return Math.min(Math.max(this, min), max);
    }
});

Jxoop.override(String, {
    gsub: function(pattern, replacement) {
        var result = '', source = this, match;
        replacement = arguments.callee.prepareReplacement(replacement);

        while (source.length > 0) {
            if (match = source.match(pattern)) {
                result += source.slice(0, match.index);
                result += (replacement(match) || '').toString();
                source = source.slice(match.index + match[0].length);
            } else {
                result += source,source = '';
            }
        }
        return result;
    },
    sub: function(pattern, replacement, count) {
        replacement = this.gsub.prepareReplacement(replacement);
        count = count === undefined ? 1 : count;

        return this.gsub(pattern, function(match) {
            if (--count < 0) return match[0];
            return replacement(match);
        });
    },
    scan: function(pattern, iterator) {
        this.gsub(pattern, iterator);
        return this;
    },
    trunc: function(length, truncation) {
        length = length || 30;
        truncation = truncation === undefined ? '...' : truncation;
        return this.length > length ?
               this.slice(0, length - truncation.length) + truncation : this;
    },
    trim: function() {
        return this.replace(/^\s+/, '').replace(/\s+$/, '');
    },
    stripTags: function() {
        return this.replace(/<\/?[^>]+>/gi, '');
    },
    stripScripts: function() {
        return this.replace(new RegExp(Jxoop.ScriptFragment, 'img'), '');
    },
    extractScripts: function() {
        var matchAll = new RegExp(Jxoop.ScriptFragment, 'img');
        var matchOne = new RegExp(Jxoop.ScriptFragment, 'im');
        return (this.match(matchAll) || []).map(function(scriptTag) {
            return (scriptTag.match(matchOne) || ['', ''])[1];
        });
    },
    evalScripts: function() {
        return this.extractScripts().map(function(script) {
            return eval(script)
        });
    },
    escapeHTML: function() {
        var div = document.createElement('div');
        var text = document.createTextNode(this);
        div.appendChild(text);
        return div.innerHTML;
    },
    unescapeHTML: function() {
        var div = document.createElement('div');
        div.innerHTML = this.stripTags();
        return div.childNodes[0] ? div.childNodes[0].nodeValue : '';
    },
    toQueryParams: function() {
        var pairs = this.match(/^\??(.*)$/)[1].split('&');
        return pairs.inject({}, function(params, pairString) {
            var pair = pairString.split('=');
            params[pair[0]] = pair[1];
            return params;
        });
    },
    toArray: function() {
        return this.split('');
    },
    camelize: function() {
        var oStringList = this.split('-');
        if (oStringList.length == 1) return oStringList[0];

        var camelizedString = this.indexOf('-') == 0
                ? oStringList[0].charAt(0).toUpperCase() + oStringList[0].substring(1)
                : oStringList[0];

        for (var i = 1, len = oStringList.length; i < len; i++) {
            var s = oStringList<i>;
            camelizedString += s.charAt(0).toUpperCase() + s.substring(1);
        }

        return camelizedString;
    },
    inspect: function() {
        return "'" + this.replace(/\\/g, '\\\\').replace(/'/g, '\\\'') + "'";
    },
    toggle : function(value, other) {
        return this == value ? other : value;
    }
});

Jxoop.extend(String, {
    escape : function(string) {
        return string.replace(/('|\\)/g, "\\$1");
    },
    leftPad : function (val, size, ch) {
        var result = new String(val);
        if (!ch) {
            ch = " ";
        }
        while (result.length < size) {
            result = ch + result;
        }
        return result.toString();
    },
    format : function(format) {
        var args = Array.prototype.slice.call(arguments, 1);
        return format.replace(/\{(\d+)\}/g, function(m, i) {
            return args<i>;
        });
    }
});

Jxoop.override(Array, {
    indexOf : function(o) {
        for (var i = 0, len = this.length; i < len; i++) {
            if (this<i> == o) return i;
        }
        return -1;
    },
    remove : function(o) {
        var index = this.indexOf(o);
        if (index != -1) {
            this.splice(index, 1);
        }
        return this;
    },
    each: function(iterator) {
        for (var i = 0,l = this.length; i < l; i++)
            if (iterator(this<i>) === false) break;
    },
    first: function() {
        return this[0];
    },
    last: function() {
        return this[this.length - 1];
    }
});

Jxoop.override(Date, {
    getElapsed : function(date) {
        return Math.abs((date || new Date()).getTime() - this.getTime());
    }
});

测试文件a.html
<script type="text/javascript" src="jxoop.js"></script>
<script type="text/javascript">
    var A = Jxoop.clazz();
    Jxoop.override(A, {
        initialize:function(C) {
            alert("A" + C);
        }
    });
    var B = Jxoop.clazz();
    Jxoop.inherit(B, A, {
        initialize:function() {
            B.superclass.initialize.apply(this, arguments);
            alert("B");
        }
    });
    var C = Jxoop.inherit(B, {
        initialize:function() {
            alert("C");
            C.superclass.initialize.apply(this, arguments);
        }
    });
    new C("arg");
    var a = [1,2,3,4];
    a.each(function(v) {
        alert(v);
        if (v == 2) return false;
    })
</script>