第一次发现JavaScript中replace()方法如果直接用str.replace("-","!")只会替换第一个匹配的字符.
而str.replace(/\-/g,"!")则可以替换掉全部匹配的字符（g为全局标志）。
replace()
Thereplace()methodreturnsthestringthatresultswhenyoureplacetextmatchingitsfirstargument
(aregularexpression)withthetextofthesecondargument(astring).
Iftheg(global)flagisnotsetintheregularexpressiondeclaration,thismethodreplacesonlythefirst
occurrenceofthepattern.Forexample,
vars="Hello.Regexpsarefun.";s=s.replace(/\./,"!");//replacefirstperiodwithanexclamationpointalert(s);
producesthestring“Hello!Regexpsarefun.”Includingthegflagwillcausetheinterpreterto
performaglobalreplace,findingandreplacingeverymatchingsubstring.Forexample,
vars="Hello.Regexpsarefun.";s=s.replace(/\./g,"!");//replaceallperiodswithexclamationpointsalert(s);
yieldsthisresult:“Hello!Regexpsarefun!”
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