JS学习笔记:Javascript类的继承

JavaScript中类的学习，从基本类继承过来方法

也可以这样实现：

Java代码

function newClass(){   
     this.firstName="frank";   
     this.toUc=String.toUpperCase;   
     this.toString=function(){   
        return this.toUc(this.firstName);   
     }   
 }   
 var nc=new newClass();   
 alert(nc);//在IE中没反应。。  
   function newClass(){
        this.firstName="frank";
        this.toUc=String.toUpperCase;
        this.toString=function(){
           return this.toUc(this.firstName);
        }
    }
    var nc=new newClass();
    alert(nc);//在IE中没反应。。

一个简单的客户端验证

Java代码

html   
head   
  titlejavascript/title   
    script type="text/javascript"   
        function doSubmit(inForm){   
            if(inForm.firstName.value==""){   
                alert("firstName is null");   
                return false;   
            }   
            if(inForm.lastName.value ==""){   
                alert("lastName is null");   
            }   
            inForm.submit();   
            return true;   
        }   
    /script   
/head   
body   
form action="#" name="test" method="post"   
    First name: input type="text" name="firstName"   
    br   
    Last name:input type="text" name="lastName"   
    br   
    input type="button" value="submit" onclick="doSubmit(this.form);"   
/form   
/body   
/html   
/form  
html
head
  titlejavascript/title
    script type="text/javascript"
        function doSubmit(inForm){
            if(inForm.firstName.value==""){
                alert("firstName is null");
                return false;
            }
            if(inForm.lastName.value ==""){
                alert("lastName is null");
            }
            inForm.submit();
            return true;
        }
    /script
/head
body
form action="#" name="test" method="post"
    First name: input type="text" name="firstName"
    br
    Last name:input type="text" name="lastName"
    br
    input type="button" value="submit" onclick="doSubmit(this.form);"
/form
/body
/html
/form

一般这样写

Java代码

form action="#" name="test" method="post" onSubmit="return doSubmit(this);"   
    First name: input type="text" name="firstName"   
    br   
    Last name:input type="text" name="lastName"   
    br   
    input type="button" value="submit"