FX系列PLC编程元件的输入继电器和输出继电器用八进制数字编号,其他均采用十进制数字编号。( )
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想要获取字符串中的某一个字符,我们可以使用()来实现。
A. charAt()
B. replace()
C. split()
D. indexOf()
下面有一段JavaScript程序,其输出结果是()。var str = "I am loser, you are loser, all are loser.";var str_new = str.replace("loser", "hero");document.write(str_new);
A. I am hero, you are hero, all are hero.
B. I am "hero", you are "hero", all are "hero".
C. I am hero, you are loser, all are loser.
D. I am "hero", you are loser, all are loser.
下面有一个数组,该数组中数值最小的和数值最大的元素下标分别是()。var arr = [3, 9, 1, 12, 36, 50, 21]
A. 2, 5
B. 3, 6
C. 2, 6
D. 3, 5
下面有一段JavaScript程序,则最终得到的数组colors中第1个元素是()。var colors = ["red", "green", "blue"];colors[1] = "yellow";
A. "red"
B. "green"
C. "yellow"
D. "blue"