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var
// Will speed up references to window, and allows munging its name.
window = this,
// Will speed up references to undefined, and allows munging its name.
undefined,
// Map over jQuery in case of overwrite
_jQuery = window.jQuery,
// Map over the $ in case of overwrite
_$ = window.$,
jQuery = window.jQuery = window.$ = function( selector, context ) {
// The jQuery object is actually just the init constructor 'enhanced'
return new jQuery.fn.init( selector, context );
},
// A simple way to check for HTML strings or ID strings
// (both of which we optimize for)
quickExpr = /^[^<]*(<(.|\s)+>)[^>]*$|^#([\w-]+)$/,
// Is it a simple selector
isSimple = /^.[^:#\[\.,]*$/;
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alert(undefined);// "undefined"
alert(typeof undefined);// "undefined"
alert(undefined instanceof Object);// "false"
alert(undefined instanceof undefined);// Óï·¨´íÎó£ºinstanceof²»ÄܶÔundefinedÔËËã
alert(undefined instanceof Undefined);// ´íÎó£º"Undefined"䶨Òå
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    <head>
        <script type="text/javascript">
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