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prototype属性允许您向任何对象(数字、布尔值、字符串、日期等)添加属性和方法。
注:Prototype是一个全局属性,几乎可用于所有对象。
语法:
string.prototype
示例:对象原型
function employee(id, name) { this.id = id; this.name = name; } var emp = new employee(123, "Smith"); employee.prototype.email = "smith@qq.com"; console.log("Employee 's Id: " + emp.id); console.log("Employee's name: " + emp.name); console.log("Employee's Email ID: " + emp.email);
输出:
Employee’s Id: 123 Employee’s name: Smith Employee’s Email ID: smith@qq.com
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