JavaScript講座 ++++[smart]indexã¯ã€ç¬¬1引数STRã®å…ˆé ã‹ã‚‰ç¬¬2引数SUBSTRãŒæœ€åˆã«è¦‹ã¤ã‹ã£ãŸä½ç½®ã‚’è¿”ã—ã¾ã™ã€‚ 第3引数 POSITIONã§æ¤œç´¢ã™ã‚‹ä½ç½®ã‚’指定ã™ã‚‹ã“ã¨ã‚‚ã§ãã¾ã™ã€‚第3引数POSITIONã«ã¯æœ€åˆã®æ–‡å—ã‚’ 0 ã¨ã—ã¦æŒ‡å®šã—ã¾ã™ã€‚ è¿”å´å€¤ã¯ 0ã€ã‚‚ã—ãã¯å¤‰æ•°$[ã«è¨å®šã—ãŸå€¤ã§ã™ã€‚SURSTRãŒè¦‹ã¤ã‹ã‚‰ãªã‹ã£ãŸå ´åˆã¯ -1 ã‚’è¿”ã—ã¾ã™ã€‚ indexã®ä½¿ã„æ–¹ $str = "How you always hurt the one you love."; print index($str,'you'); > 4
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