Javascript函数删除前导点

Question

I have a javascript string which have a leading dot. I want to remove the leading dot using javascript replace function. I tried the following code.

var a = '.2.98»';
document.write(a.replace('/^(\.+)(.+)/',"$2"));

But this is not working. Any Idea?

Answer 1

下面用空字符串替换字符串开头的一个点，保持字符串的其余部分不变：

a.replace(/^\./, "")

Answer 2

Don't do regexes if you don't need to.

A simple charAt() and a substring() or a substr() (only if charAt(0) is . ) will be enough.

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Resources:

• developer.mozilla.org: charAt()
• developer.mozilla.org: substring()
• developer.mozilla.org: substr()

Answer 3

Your regex is wrong.

var a = '.2.98»';
document.write(a.replace('/^\.(.+)/',"$1"));

You tried to match (.+) to the leading dot, but that doesn't work, you want \\. instead.

Answer 4

Keep it simple:

if (a.charAt(0)=='.') {
  document.write(a.substr(1));
} else {
  document.write(a);
}