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关于对象化编 程的语句 现在我们有实力学习以下关于对象化编程,但其实属于上一章的内容了。 with 语句 为一个或一组语句指定默认对象。 用法:with (<对象>) <语句>; x = Math.cos(3 * Math.PI) + Math.sin(Math.LN10); y = Math.tan(14 * Math.E); with (Math) { x = cos(3 * PI) + sin(LN10); y = tan(14 * E); } <script> ... function check(formObj) { ... } ... </script> <body ...> ... <form ...> ... <input type="text" ... onchange="check(this.form)"> ... </form> ... </body> function <构造函数名> [(<参数>)] { ... this.<属性名> = <初始值>; ... } var <变量名> = new <构造函数名>[(<参数>)]; function Is() { var agent = navigator.userAgent.toLowerCase(); this.major = parseInt(navigator.appVersion); //主版本号 this.minor = parseFloat(navigator.appVersion);//全版本号 this.ns = ((agent.indexOf('mozilla')!=-1) && ((agent.indexOf('spoofer')==-1) && //是否 Netscape (agent.indexOf('compatible') == -1))); this.ns2 = (this.ns && (this.major == 3)); //是否 Netscape 2 this.ns3 = (this.ns && (this.major == 3)); //是否 Netscape 3 this.ns4b = (this.ns && (this.minor < 4.04)); //是否 Netscape 4 低版本 this.ns4 = (this.ns && (this.major >= 4)); //是否 Netscape 4 高版本 this.ie = (agent.indexOf("msie") != -1); //是否 IE this.ie3 = (this.ie && (this.major == 2)); //是否 IE 3 this.ie4 = (this.ie && (this.major >= 4)); //是否 IE 4 this.op3 = (agent.indexOf("opera") != -1); //是否 Opera 3 this.win = (agent.indexOf("win")!=-1); //是否 Windows 版本 this.mac = (agent.indexOf("mac")!=-1); //是否 Macintosh 版本 this.unix = (agent.indexOf("x11")!=-1); //是否 Unix 版本 } var is = new Is(); function myFriend(theName, gender, theAge, birthOn, theJob) { this.name = theName; this.isMale = (gender.toLowerCase == 'male'); this.age = theAge; this.birthday = new Date(birthOn); this.job = theJob } var Stephen = new myFriend('Stephen', 'Male', 18, 'Dec 22, 1982', 'Student'); |
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