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    * showModalDialog() (IE 4+ Ö§³Ö)£¬ÓÃÀ´´´½¨Ò»¸öÏÔʾHTMLÄÚÈݵÄģ̬¶Ô»°¿ò¡£
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N.2 ʹÓ÷½·¨£º
    * vReturnValue = window.showModalDialog(sURL [, vArguments] [,sFeatures])
    * vReturnValue = window.showModelessDialog(sURL [, vArguments] [,sFeatures])
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         5. center: {yes | no | 1 | 0 }£º´°¿ÚÊÇ·ñ¾ÓÖУ¬Ä¬ÈÏyes£¬µ«ÈÔ¿ÉÒÔÖ¸¶¨¸ß¶ÈºÍ¿í¶È¡£
         6. help: {yes | no | 1 | 0 }£ºÊÇ·ñÏÔʾ°ïÖú°´Å¥£¬Ä¬ÈÏyes¡£
         7. resizable: {yes | no | 1 | 0 } £Û£É£Å£µ£«£Ý£ºÊÇ·ñ¿É±»¸Ä±ä´óС¡£Ä¬ÈÏno¡£
         8. status: {yes | no | 1 | 0 } £ÛIE5+£Ý£ºÊÇ·ñÏÔʾ״̬À¸¡£Ä¬ÈÏΪyes[ Modeless]»òno[Modal]¡£
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