更多"[单选题]【单选题】(单选题)以下代码的运行结果是(),var a='"的相关试题:
[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 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 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]以下代码var vm = new Vue({ el: '#app',data: {cityName: 'shanghai'},// 使用 watch 监听cityName 变化watch: {cityName (newName, oldName) { consolE.log(newName, oldName)}}})vm.$datA.cityName = 'beijing'执行后的结果是( )。
A.B ei shang
B.shanghai
C.beijing shanghai
D.beijing
[单选题]以下代码var vm = new Vue({ el: '#app',data: { price: 20,num: 1},computed: {// 总价格 totalPrice totalPrice () {return this.price * this.num}}})consolE.log(vm.totalPrice);执行后的结果是( )。
A.0
B.2
C.20
D.1
[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]以下代码是为运行带别名myservlet 的servlet用的：
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Hello extends HttpServlet{
public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
res.setContentType(“text/html”);
PrintWriter out = res.getWriter();
out.println(“”);
System.out.println(“Welcome”);
out.println(“”);
}
}
当你调用此servlet 时，其输出将是什么？
A.将显示带有文本Welcome的页面
B.将是一个异常
C.将没有任何输出
D.将显示空白页面
[单选题]分析如下的 JavaScript 代码段, 则运行后在页面上输出( )
var c="10",d=10;
document.write(c+d)
A.10
B.20
C.1010
D.页面报错
[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]以下程序运行的结果为( )
Var person1={
Name:’lucy’,
Age: 18,
Sex: ‘男’
}
Var person2=person1;
Person1.name=’king’;
Person2.age=20;
Console.log(person2.name);
Console.log(person1.age);
A. king 20
B. lucy 20
C. king 18
D. lucy 18
[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
