htmljavascript核心语言对象

4、variableinobject){statements;}color=newArray("红色","蓝色","绿色");for(varpropincolor){varrecord="color";record+=prop+"="+color[prop]+"
";document.write(record);}8new语句new操作符用于新建对象类型实例。用法objectName=newobjectT

5、ype(param1[,param2]...[,paramN])functionemployee(name,code,designation){this.name=namethis.code=codethis.designation=designation}newemp=newemployee("JohnDias","A001","职员");document.write("雇员姓名："+newemp.name+"
");document.writ

6、e("雇员代号："+newemp.code+"
");document.write("头衔："+newemp.designation);9with语句with语句用于执行一组语句，所有这些语句都假定引用指定的对象。用法with(object){statements;}vara,b,c;varr=10;with(Math){a=PI*r*r;b=r*cos(PI);c=r*sin(PI/2);}docu

7、ment.write(a+"
");document.write(b+"
");document.write(c+"
");10eval语句eval函数用于计算代码串，而不引用任何特定对象。用法eval(string)varx=5;varz=10;document.write(eval("x+z+5"));11字符串对象字符串对象用于操纵和处理文本字符串。用法strin

8、gName.propertyNamestringName.methodName创建字符串的方法使用var语句，并对为其赋值（可选）使用赋值运算符(=)及变量名使用string()构造函数12字符串对象的属性和方法属性length方法b