js原型链继承和闭包例子

 <script type="text/javascript">Function.prototype.method = function(name,func){this.prototype[name] = func;return this;}String.method('deentityify',function(){var entity={quot:'"',lt:'<',gt:'>'};return function(){return this.replace(/&([^&;]+);/g,function(a,b){var r = entity[b];return typeof r==='string'?r:a;});};}());document.writeln('<">'.deentityify());//<"></script>