在javascript中，如何用javascript对象中的另一个字母替换一个字母？

Question

 var trim = function() { for (int i = 0; i < this.length; i++) { if (this[i] == 'a') { this[i] = 'b' } } }

i dont know what's wrong with that code?

Answer 1

Javascript strings are immutable . They are objects whose values can not be changed.

To wit:

var str = "hello";
str[2] = "x";
console.log(str); // outputs "hello"

To change a single character, you must split the string, and join it again.

"hello" -> "he" + "x" + "lo" -> "hexlo"

To replace a letter with another letter, a regex solution is better:

"aardvark".replace(/a/g, 'b'); // outputs "bbrdvbrk"