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1  Math¶ÔÏóµÄ·½·¨
1.1  Math.abs
Math¶ÔÏóÖм¯ºÏÁËÐí¶à³£ÓÃÊýѧº¯Êý¡£Math.abs¾ÍÊÇÓÃÀ´¼ÆËãÒ»¸öÊýµÄ¾ø¶ÔÖµ£¬¼´Ò»¸öÊýÈ¥µôÕý¸º·ûºÅºóµÄÖµ¡£ÆäÓ÷¨ÈçÏ£º
x=Math.abs(-9);
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x=Math.abs(num1-num2);
11.1.2  Math.round
Math.round·½·¨½«Ò»¸ö¸¡µãÊýËÄÉáÎåÈëΪ×î½Ó½üµÄÕûÊý£¬È磺
trace(Math.round(9.4));
trace(Math.round(9.5));
trace(Math.round(-9.4));
trace(Math.round(-9.5));
trace(Math.round(-9.6));
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11.1.3  Math.ceil¡¢Math.floor
Math.ceil·½·¨È¡±ÈÒ»¸ö¸¡µãÊý´óÇÒ×î½Ó½üµÄÕûÊý£¬Math.floor·½·¨È¡±ÈÒ»¸ö¸¡µãÊýСÇÒ×î½Ó½üµÄÕûÊý¡£
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trace(Math.ceil(9.1));
trace(Math.floor(9.1));
trace(Math.ceil(-9.1));
trace(Math.floor(-9.1));
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1.4  Math.min¡¢Math.max
Math.min·½·¨È¡Á½¸öÊýÖнÏСµÄÒ»¸öÊý£¬Math.max·½·¨È¡Á½¸öÊýÖнϴóµÄÒ»¸öÊý£¬È磺
trace(Math.min(9,
8));
trace(Math.max(9,
8));
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1.5  Math.pow
Math.pow·½·¨ÓÃÀ´¼ÆËãÒ»¸öÊýµÄ³Ë·½£¬Ëü°üº¬Á½¸ö²ÎÊý£¬µÚ1¸ö²ÎÊýÊǵ×Êý£¨Òª³Ë·½µÄÊý£©£¬µÚ2¸ö²ÎÊýÊÇÃÝ£¨³Ë·½Êý£©¡£Èç¼ÆËã5µÄ3´Î·½£º
trace(Math.pow(5,
3));
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125
Math.pow·½·¨Ò²¿ÉÒÔ¼ÆËãÒ»¸öÊýµÄ¿ª·½£¬Èç¼ÆËã125µÄ¿ª3´Î·½£º
trace(Math.pow(125,
1/3));
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1.6  Math.sqrt
³ýÁËÓÃMath.pow¼ÆËãÒ»¸öÊýµÄ¿ª·½£¬»¹¿ÉÒÔʹÓÃMath.sqrt¼ÆËãÒ»¸öÊýµÄƽ·½¸ù£¬Èç¼ÆËã64µÄƽ·½¸ù£º
trace(Math.sqrt(64));
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trace(Math.pow(64,
1/2));
2  Math¶ÔÏóµÄ³£Êý
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Math.PI£ºÔ²ÖÜÂÊ£¨´óԼΪ3.141593£©¡£
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