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JS 参考手册
JavaScript Object prototype 对象原型属性
tryjsref_prototype
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<!DOCTYPE html> <html> <body> <p id="demo"></p> <script> function employee(name, jobtitle, born) { this.name = name; this.jobtitle = jobtitle; this.born = born; } employee.prototype.salary = 2000; var fred = new employee("Fred Flintstone", "Caveman", 1970); document.getElementById("demo").innerHTML = fred.salary; </script> </body> </html>