javascript - String.charCodeAt 最大长度

Question

拿这段代码:

var charCode = unkownVariable.charCodeAt(0);

charCode 的最大长度是多少？我所有的测试结果都是 2 个字符(2 位数字)。会更长吗？

Answer 1

来自specification :

Returns a Number (a nonnegative integer less than 2¹⁶) representing the code unit value of the character at position pos in the String resulting from converting this object to a String. If there is no character at that position, the result is NaN.

因此，2¹⁶ - 1 是最大值，即 65535。