http://fuleonardo.iteye.com/blog/339749

第一次發現JavaScript中replace()?方法如果直接用str.replace("-","!")?只會替換第一個匹配的字符.?
而str.replace(/\-/g,"!")則可以全部替換掉匹配的字符(g為全局標志)。?

replace()?
The?replace()?method?returns?the?string?that?results?when?you?replace?text?matching?its?first?argument?
(a?regular?expression)?with?the?text?of?the?second?argument?(a?string).?
If?the?g?(global)?flag?is?not?set?in?the?regular?expression?declaration,?this?method?replaces?only?the?first?
occurrence?of?the?pattern.?For?example,?

var??s?=?"Hello.?Regexps?are?fun."?;s?=?s.replace(/\./,?"!"?);?//?replace?first?period?with?an?exclamation?pointalert(s);

produces?the?string?“Hello!?Regexps?are?fun.”?Including?the?g?flag?will?cause?the?interpreter?to?
perform?a?global?replace,?finding?and?replacing?every?matching?substring.?For?example,?

var??s?=?"Hello.?Regexps?are?fun."?;s?=?s.replace(/\./g,?"!"?);?//?replace?all?periods?with?exclamation?pointsalert(s);

yields?this?result:?“Hello!?Regexps?are?fun!”?

所以可以用以下幾種方式.：
string.replace(/reallyDo/g,?replaceWith);
string.replace(new?RegExp(reallyDo,?'g'),?replaceWith);

總結

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