更多"[单选题]【单选题】(单选题)以下代码的输出结果是(),var i=1"的相关试题:
[单选题]
(单选题)以下代码的输出结果是()
Var f = function g() {
Return 23;
};
Typeof g();
A."number"
B."undefined"
C."function"
D.Error
[单选题]
(单选题)以下代码的输出结果是(),
Var scope="global scope";
Function checkscope(){
Var scope="local scope";
Function nested(){
Var scope="nested scope";
Return scope;
}
Return nested();
}
Console.log(checkscope());
A."global scope"
B."local scope"
C."nested scope"
D.null
[单选题]【单选题】
(单选题)以下代码的输出结果是(),
Var scope="global scope";
Function checkscope(){
Var scope="local scope";
Function nested(){
Var scope="nested scope";
Return scope;
}
Return nested();
}
Console.log(checkscope());
A."global scope"
B."local scope"
C."nested scope"
D.null
[单选题]【单选题】
(单选题)以下代码的输出结果是()
Var f = function g() {
Return 23;
};
Typeof g();
A."number"
B."undefined"
C."function"
D.Error
[单选题]
(单选题)以下代码的输出结果是(),var i=1,b=++i,c=i++;console.log(i+","+b+","+c);
A.1,2,3
B.2,2,3
C.1,2,2
D.3,2,2
[单选题]
(单选题)下面的代码输出的结果是()
Var name="Tom";
Function foo(){
Console.log(name);
Var name="Jerry";
Console.log(name);
}
Foo();
A.undefined
"Jerry"
B."Tom"
"Jerry"
C."Tom"
Undefined
D."Jerry"
"Jerry"
[单选题]分析下面的JavaScript代码段，输出结果是( )
var mystring="I am a student";
a=mystring.charAt(9);
document.write(a);
A.I am a st
B.U
C.Udent
D.T
[单选题]【单选题】
(单选题)下面的代码输出的结果是()
Var name="Tom";
Function foo(){
Console.log(name);
Var name="Jerry";
Console.log(name);
}
Foo();
A.undefined
"Jerry"
B."Tom"
"Jerry"
C."Tom"
Undefined
D."Jerry"
"Jerry"
[单选题]分析下面的 Javascript 代码段，输出结果是（)
var mystring=”I am a student”;
var a=mystring.substring(9,13);
document.write(a);
A.stud
B.tuden
C.uden
D.udent
[单选题]分析下面的 Javascript 代码段，输出结果是（）
var s1=parseInt(“101 中学”);
document.write(s1);
A.NaN
B.101 中学
C.101
D.出现脚本错误
[单选题]
(单选题)以下代码的运行结果是(),var a="12px";var b=3;console.log(a+b);console.log(Number(a));
A.15px/12
B.12px3/12
C.15px/NaN
D.12px3/NaN
[单选题]【单选题】
(单选题)以下代码的运行结果是(),
Var x=true+1;
Var y=true+"1";
Var z=true+1+"1";
Console.log(x+","+y+","+z);
A."true1","true1","true2"
B.2,"true1","true11"
C.2,2,3
D.2,"true1","21"
[单选题]
(单选题)以下代码的运行结果是(),
Var x=true+1;
Var y=true+"1";
Var z=true+1+"1";
Console.log(x+","+y+","+z);
A."true1","true1","true2"
B.2,"true1","true11"
C.2,2,3
D.2,"true1","21"
[单选题]
(单选题)以下代码的运行结果是(),
Var scope="global";
Function checkscope(){
Scope="local";
Myscope="local";
Return [scope,myscope]
}
Console.log(checkscope());
Console.log(scope);
Console.log(myscope);
A.先后输出值为["global","local"],global,local
B.先后输出值为["local","local"],local,local
C.先后输出值为["local","global"],global,local
D.先后输出值为["global","global"],local,local
[单选题]【单选题】
(单选题)以下代码的运行结果是(),var a="12px";var b=3;console.log(a+b);console.log(Number(a));
A.15px/12
B.12px3/12
C.15px/NaN
D.12px3/NaN
[单选题]【单选题】
(单选题)以下代码的运行结果是(),
Var scope="global";
Function checkscope(){
Scope="local";
Myscope="local";
Return [scope,myscope]
}
Console.log(checkscope());
Console.log(scope);
Console.log(myscope);
A.先后输出值为["global","local"],global,local
B.先后输出值为["local","local"],local,local
C.先后输出值为["local","global"],global,local
D.先后输出值为["global","global"],local,local
[单选题]阅读以下代码，输出结果为（）
class A
{
public:
virtual void a()=0;
virtual ~A(){}
};
class AA:public A
{
public:
void a()
{
cout<<"nihao 2\n";
}
~AA()
{
cout<<"delete AA \n";
}
};
class AAA:public AA
{
public:
void a()
{
cout<<"nihao 3 \n";
}
~AAA()
{
cout<<"delete AAA \n";
}
};
class B
{
public:
A *b(int kind)
{
if(kind == 1)
return new AA;
else
return new AAA;
}
~B()
{
cout<<"delete B\n";
}
};
int main()
{
B *bb = new B;
A *aa = bb->b(1);
aa->a();
aa = bb->b(2);
aa->a();
delete aa;
delete bb;
return 0;
}
A.
nihao2
nihao3
delete AA
delete AAA
delete B
B.
nihao3
nihao3
delete AAA
delete AA
delete B
C.
nihao2
nihao2
delete AAA
delete AA
delete B
D.
nihao2
nihao3
delete AAA
delete AA
delete B
