• 2022-05-29
    以下程序的输出结果是( )。 Dim var1 Dim var2 Dim var3 var1 = "Hello" var2 = "World !" var3 = var1&" "&var2 var1 = 10 var2 = 20 MsgBox var1 + var2
    A: Hello World! 30
    B: 30
    C: 102
    D: Hello World!
  • B

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    • 0

      下列程序的运行结果是( )。var arr1=[1,2,3,4,5,6];var arr2=["hello","world"];var arr=arr1.concat(arr2);document.write(arr1); A: "hello","world" B: 1,2,3,4,5,6 C: 1,2,3,4,5,6,"hello","world" D: "hello","world",1,2,3,4,5,6

    • 1

      创建一个包含3个元素的数组的方式是 A: var num=[1, 2, 3]; B: var num={1, 2, 3}; C: var num=new Array(1, 2, 3); D: var num=new Array[1, 2, 3];

    • 2

      11字符串测试1:下列字符串定义正确的是: A: String str="Hello World!"; B: Str str="Hello World!"; C: var str="Hello World!"; D: var str='Hello World!';

    • 3

      var a = 10; { var a = 100; console.log(a)//(1) } console.log(a)//(2)

    • 4

      以下数组的定义中____________是错误的 A: var a = new Array() B: var a = new Array(10); C: var a[10] = {1,2,3}; D: var a = ["1","2","3"];