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$wnd and $doc Calling native JavaScript with JSNI

$wnd and $doc Calling native JavaScript with JSNI
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GWT provides the $wnd and $doc variables to refer to the window and document objects
GWTʹÓÃͨ¹ýJava Native methodʹÓÃËü£¬ÉùÃ÷Ò»¸önative·½·¨£¬½«º¬ÓÐJavaScriptµÄ·½·¨Ìå×¢ÊÍ¡£±àÒëÆ÷½«×¢ÊÍ¿éÄÚµÄÄÚÈÝÖð×ÖÊä³ö£¬Ê¹Ö®Óë±àÒë²úÉúµÄJavaScriptÕûºÏµ½Ò»Æð¡£
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JSNI·½·¨¶¨ÒåÐèҪʹÓÃnative¹Ø¼ü×Ö£¬²¢ÇÒÐèÒªÔÚ²ÎÊýÁбíÖ®ºó£¬½áβµÄ·ÖºÅ֮ǰ¶¨Òå¡£JSNI·½·¨µÄ¿ªÊ¼Ê¹Óà /*-{ , ½áβʹÓÃ}-*/,ÀýÈ磺
public static native void alert(String msg) /*-{
         $wnd.alert(msg);
}-*/;
ÕâÊÇgwt  Window ÀàÖеÄÔ´Âë--Ò»¸ö±ê×¼µÄjsni ·½·¨, ÎÒÃÇ¿ÉÒÔ¿´µ½,·½·¨ÊµÏÖ¾ÍÊÇÒ»Ðмòµ¥µÄjavascript ´úÂë. (ÕâÀïûÓÐÓà alert »òÕß window.alert µÄÔ­ÒòÊÇ: gwt ´úÂëÔËÐÐÔÚÒ»¸öiframeÖÐ,Èç¹ûÖ±½ÓÓÃalert»òÕßwindow.alert,ÒýÓõÄÊÇiframeÎĵµ,¶ø²»ÊÇhost page Îĵµ). ¾­¹ýÕâ¸ö·½·¨°ü×°,ÒÔºóÔÚgwt³ÌÐòÖÐʹÓà " Window.alert"  ʵ¼ÊÉϾÍÊǵ÷ÓÃÁËjavascript µÄ alert ·½·¨,µ±È»ÄãÒ²¿ÉÒÔ²»ÓÃÕâ¸ö·â×°, Ö±½ÓʵÓà $wnd.alert .
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 http://www.javaeye.com/topic/365678
http://www.webreference.com/programming/java/toolkits/
The GWT makes ingenious use of Java's native methods with something called the JavaScript Native Interface. You declare native methods with commented-out bodies that contain JavaScript. When those native methods are compiled, the GWT incorporates the commented JavaScript. Here's an example of such a native method:
Calling native JavaScript with JSNI
http://www.ibm.com/developerworks/java/library/j-ajax4/
Visual-effects libraries are becoming increasingly popular in Web application development, whether their effects are used to provide subtle user-interaction cues or just to add polish. I'd like to add some eye-candy to the Weather Reporter application. GWT doesn't provide this type of functionality, but its JavaScript Native Interface (JS


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