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<!DOCTYPE html> <html> <body> <h1>JavaScript</h1> <h2>prototype 属性</h2> <p>prototype 属性允许您向字符串添加新的属性和方法。</p> <p>向所有雇员添加薪酬属性：</p> <p id="demo"></p> <script> function employee(name, jobtitle, born) { this.name = name; this.jobtitle = jobtitle; this.born = born; } employee.prototype.salary = 2000; const fred = new employee("Bill Gates", "CEO", 1955); document.getElementById("demo").innerHTML = fred.salary; </script> </body> </html>