您应该使用单个正则表达式的字符串替换功能。
假设特殊字符，你的意思是任何不是字母，这是一个解决方案：

You should use the string replace function, with a single regex. Assuming by special characters, you mean anything that's not letter, here is a solution:

var str = "abc's test#s";
alert(str.replace(/[^a-zA-Z ]/g, ""));