Javascript usage of attachevent and addeventlistener

Javascript usage of attachevent and addeventlistener

 

The attachevent method attaches other processing events to an event. (Mozilla series not supported) The addeventlistener method is used in the Mozilla series for example: Java code document. getelementbyid ("BTN "). onclick = Method1; document. getelementbyid ("BTN "). onclick = method2; document. getelementbyid ("BTN "). onclick = method3; document. getelementbyid ("BTN "). onclick = Method1; document. getelementbyid ("BTN "). onclick = method2; document. getelementbyid ("BTN "). onclick = method3; if it is written in this way, only medhot3 will be executed as follows: Java code: var btn1obj = Document. getelementbyid ("btn1"); // object. attachevent (event, function); btn1obj. attachevent ("onclick", Method1); btn1obj. attachevent ("onclick", method2); btn1obj. attachevent ("onclick", method3); var btn1obj = document. getelementbyid ("btn1"); // object. attachevent (event, function); btn1obj. attachevent ("onclick", Method1); btn1obj. attachevent ("onclick", method2); btn1obj. attachevent ("onclick", method3); the execution sequence is If method3-> method2-> Method1 is a Mozilla series and does not support this method, you need to use the addeventlistener Java code: var btn1obj = document. getelementbyid ("btn1"); // element. addeventlistener (type, listener, usecapture); btn1obj. addeventlistener ("click", Method1, false); btn1obj. addeventlistener ("click", method2, false); btn1obj. addeventlistener ("click", method3, false); var btn1obj = document. getelementbyid ("btn1"); // element. addeventlistener (Type, Listener, usecapture); btn1obj. addeventlistener ("click", Method1, false); btn1obj. addeventlistener ("click", method2, false); btn1obj. addeventlistener ("click", method3, false); the execution sequence is Method1-> method2-> method3 instance: 1. Java code: var El = editform_document.body; // get the object first. editform_document is actually an IFRAME if (El. addeventlistener )... {el. addeventlistener ('click', kinddisablemenu, false);} else if (El. attachevent )... {el. attachevent ('onclick', kinddisablemenu);} var El = editform_document.body; // get the object first. editform_document is actually an iframeif (El. addeventlistener )... {el. addeventlistener ('click', kinddisablemenu, false);} else if (El. Attachevent)... {El. attachevent ('onclick', kinddisablemenu);} 2. Java code: If (window. addeventlistener )... {window. addeventlistener ('load', _ Uco, false);} else if (window. attachevent )... {window. attachevent ('onload', _ Uco );}