<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <script type="text/javascript"> /* with语句:有了 With 语句，在存取对象属性和调用方法时就不用重复指定对象。 格式： with(对象){ } */ with(document){ for(var i = 0 ; i<5; i++){ for(var j =0 ; j<=i ; j++){ write("* "); } write("<br/>"); } write("<hr/>"); } function Person(id , name){ this.id = id; this.name = name; } //创建一个对象 var p = new Person(110,"狗娃"); with(p){ document.write("编号："+ p.id); document.write("姓名："+ name); } </script> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> </head> <body> </body> </html>