JavaScript 对象专题
JavaScript 对象
JS Array
JS Boolean
JS Date
JS Math
JS Number
JS String
JS RegExp
JS Functions
JS Events

http://www.w3school.com.cn/js/js_reference.asp

prototype 属性使您有能力向对象添加属性和方法。

语法

object.prototype.name=value<script type="text/javascript">String.prototype.trim = function() {        return this.replace(/^[\s\u3000\xA0]+|[\s\u3000\xA0]+$/g,"");     }  function Employee(name,job,born){this.name=name;this.job=job;this.born=born;}var bill=new Employee("  Bill Gates","Engineer",1985);Employee.prototype.salary=null;bill.salary=20000;document.write(bill.salary);document.write(bill.name.trim());-- 结果2000Bill Gates</script>