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1. Build the following code
1<! DOCTYPE html>2"http://www.w3.org/1999/xhtml">34<meta http-equiv="Content-type"Content="text/html; Charset=utf-8"/>5<title></title>6<script>7 //Ext extension Method of the principle, for the JS extension method8Object.prototype.Get=function (key, defaultvalue) {9 if( This[key]) {Ten return This[key]; One}Else { A if(defaultvalue) { - returnDefaultValue; - } the } - } - varperson = { -Name'Good', +Age - - } +Alert (person.Get('name','Novalue'));//using the extension method to get A //alert (person[' name '); Here you get the name at</script> - -<body> - -</body> -2. Right-click in the browser to view, get name;
Learn JavaScript is not a look to understand, ExtJS is an extension of JS, is a JS write framework.
Learning ExtJS in. NET (fourth case ExtJS extension principle)
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