• 2021-04-14
    已知定义如下
    var a = "abcd";
    var b = "abcd";
    var c = new String("abcd");
    var d = new String("abcd");
    下列输出是()
    document.writeln(a == b);
    document.writeln(a === b);
    document.writeln(a == c);
    document.writeln(a === c);
    document.writeln(c == d);
    document.writeln(c === d);
  • 举一反三