摘要：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> </head> <body> <script > class Car{ constructor(name,year) { this.name=name; this 阅读全文
摘要：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> </head> <body> <script > //参数无需声明 调用时少了参数自动默认undefined function myFunction(x,y){ 阅读全文