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½â¾ö·½·¨:ͳһʹÓÃdocument.formName.elements["elementName"].
JQUERY:
$("#idName")
   
2.¼¯ºÏÀà¶ÔÏóÎÊÌâ
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½â¾ö·½·¨:ͳһʹÓÃ[]»ñÈ¡¼¯ºÏÀà¶ÔÏó.
JQUERY:[]
JQUERY.each(obj,callback) ͨÓõıéÀú·½·¨£¬¿ÉÓÃÓÚ±éÀúÊý×éºÍ¶ÔÏó
   
3.×Ô¶¨ÒåÊôÐÔÎÊÌâ
˵Ã÷:IEÏÂ,¿ÉÒÔʹÓûñÈ¡³£¹æÊôÐԵķ½·¨À´»ñÈ¡×Ô¶¨ÒåÊôÐÔ,Ò²¿ÉÒÔʹÓÃgetAttribute()»ñÈ¡×Ô¶¨ÒåÊôÐÔ;FirefoxÏÂ,Ö»ÄÜʹÓÃgetAttribute()»ñÈ¡×Ô¶¨ÒåÊôÐÔ.
½â¾ö·½·¨:ͳһͨ¹ýgetAttribute()»ñÈ¡×Ô¶¨ÒåÊôÐÔ.
JQUERY: attr
attr(name) //È¡µÃÒ»¸öÆ¥ÅäÔªËØµÄÊôÐÔÖµ. return Object£»
attr(properties) // ½«Ò»¸ö"Ãû/Öµ"ÐÎʽµÄ¶ÔÏóÉèÖÃΪËùÓÐÆ¥ÅäÔªËØµÄÊôÐÔ. return jQuery;
attr(key,value) //ΪËùÓÐÆ¥ÅäÔªËØÉèÖÃÒ»¸öÊôÐÔÖµ¡£
attr(key,fn) //ΪËùÓÐÆ¥ÅäÔªËØÉèÖÃÒ»¸ö¼ÆËãµÄÊôÐÔÖµ¡£
removeAttr(name) //´Óÿ¸öÆ¥ÅäµÄÔªËØÉ¾³ýÊôÐÔ
   
4.eval("idName")ÎÊÌâ
˵Ã÷:IEÏÂ,,¿ÉÒÔʹÓÃeval("idName")»ògetElementById("idName")À´È¡µÃidΪidNameµÄHTML¶ÔÏó;FirefoxÏÂÖ»ÄÜʹÓÃgetElementById("idName")À´È¡µÃidΪidNameµÄHTML¶ÔÏó.
½â¾ö·½·¨:ͳһÓÃgetElementById("idName")À´È¡µÃidΪidNameµÄHTML¶ÔÏó.
   
   
5.±äÁ¿ÃûÓëijHTML¶ÔÏóIDÏàͬµÄÎÊÌâ
˵Ã÷:IEÏÂ,HTML¶ÔÏóµÄID¿ÉÒÔ×÷ΪdocumentµÄÏÂÊô¶ÔÏó±äÁ¿ÃûÖ±½ÓʹÓÃ;FirefoxÏÂÔò²»ÄÜ.FirefoxÏÂ,¿ÉÒÔʹÓÃÓëHTML¶ÔÏóIDÏàͬµÄ±äÁ¿Ãû;IEÏÂÔò²»ÄÜ¡£
½â¾ö·½·¨:ʹÓÃdocument.getElementById("idName")´úÌædocument.idName.×îºÃ²»ÒªÈ¡HTML¶ÔÏóIDÏàͬµÄ±äÁ¿Ãû,ÒÔ¼õÉÙ´íÎó;ÔÚÉùÃ÷±äÁ¿Ê±,Ò»ÂɼÓÉÏvar,ÒÔ±ÜÃâÆçÒå.
   
6.constÎÊÌâ
˵Ã÷:FirefoxÏÂ,¿ÉÒÔʹÓÃconst¹Ø¼ü×Ö»òvar¹Ø¼ü×ÖÀ´¶¨Òå³£Á¿;IEÏÂ,Ö»ÄÜʹÓÃvar¹Ø¼ü×ÖÀ´¶¨Òå³£Á¿.
½â¾ö·½·¨:ͳһʹÓÃvar¹Ø¼ü×ÖÀ´¶¨Òå³£Á¿.
   
   
7.input.typeÊôÐÔÎÊÌâ
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alert(a);   //undefined
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