JQuery 포함 여부 확인

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if( typeof jQuery == 'undefined' ) {    var jQ = document.createElement( 'script' );    jQ.type = 'text/javascript';    jQ.onload = runthis;    jQ.src = 'http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js';    document.body.appendChild( jQ ); } else    runthis();   function runthis() {    // your JavaScript code goes here! }

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