javascript good parts function

good parts functions

//原型继承
if (typeof Object.beget !== 'function') {
    Object.create = function(o) {
        var F = function() {};
        F.prototype = o;
        return new F();
    };
}

//var new_o = Object.create(old_o);

//扩充功能
Function.prototype.method = function(name, func) {
    if (!this.prototype[name]) {
        this.prototype[name] = func;
    }
    return this;
};
//取整
Number.method('integer', function() {
    return Math[this < 0 ? 'ceil' : 'floor'](this);
});
//移除首尾空白
String.method('trim', function() {
    return this.replace(/^\s+|\s+$/g, '');
});