JavaScriptæååå¦çã¯"+="ãååé«éãSafariããã¿ã¼ | ã¨ã³ã¿ã¼ãã©ã¤ãº | ãã¤ãããã¥ã¼ã¹ã«ã³ã£ããããã®ã§ãæè¿ã®Firefox(Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1a2pre) Gecko/2008080108 Minefield/3.1a2pre)ã§ãã³ããã¼ã¯ãè¡ãªã£ãã+=ã¯ç¢ºãã«æ©ãã console.time("String.concat"); var s = ""; for (var i = 0;i < 10000;i++) s += String.concat( "aaa", "bbb", "cccc", "dddd" ); console.timeEnd("String.concat"); console.time("Array.prototype.joi
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