更多"[单选题](单选题)下面运行的结果是()Var v1 = []Var "的相关试题:
[单选题]【单选题】
(单选题)下面运行的结果是()
Var v1 = []
Var v2 = {};
Var v3 = {};
Function foo(v1, v2, v3)
{
V1 = [1];
V2 = [2];
V3 = {a:3}
}
Foo(v1, v2, v3);
Alert (v1);
Alert (v2);
Alert (v3.a);
A.空白
[object Object]
Undefined
B.1
2
3
C.空白
2
3
D.空白
2
Undefined
[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]测得工作在放大电路中三极管的电位值V1=3.5V， V2=2.8V， V3=12V。判断管子的材料(____)。
A.硅管；
B.锗管；
C.钠管；
D.锂管
[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]用万用表直流电压挡测得晶体管三个管脚的对地电压分别是V1＝2V，V2＝6V，V3＝2.7V，由此可判断该晶体管的管型和三个管脚依次为()
A.A.PNP管，CBE
B.B.NPN管，ECB
C.C.NPN管，CBE
D.D.PNP管，EBC
[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)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] 用万用表直流电压档测得三极管三个管脚的对地电压分别是V1=2V、V2=6V、V3=2.7V,则三极管的三个管脚分别是
A.CBE
B.ECB
C.CBE
D.EBC
[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]
(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
