/*
The window object represents a window in browser.
An object of window is created automatically by the browser.
Window is the object of browser, it is not the object of javascript.
*/
<script type="text/javascript">
function msg(){
alert("Hello Alert Box");
}
</script>
<input type="button" value="click" onclick="msg()"/>
function getQueryStringValue (key) {
return decodeURIComponent(window.location.search.replace(new RegExp("^(?:.*[&\\?]" + encodeURIComponent(key).replace(/[\.\+\*]/g, "\\$&") + "(?:\\=([^&]*))?)?.*$", "i"), "$1"));
}
// Would write the value of the QueryString-variable called name to the console
console.log(getQueryStringValue("name"));
The window object is a global object that has the properties pertaining to the current DOM document, which is what's in the tab of a browser. The document property of the window object has the DOM document and associated nodes and methods that we can use to manipulate the DOM nodes and listen to events for each node.