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                字符串對象的`search`方法,返回第一個滿足條件的匹配結果在整個字符串中的位置。如果沒有任何匹配,則返回`-1`。 ~~~ '_x_x'.search(/x/) // 1 ~~~ 上面代碼中,第一個匹配結果出現在字符串的`1`號位置。
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