jQuery.globalEval
$.globalEval utility is a useful function, because it is preferred compare with eval in calling ajax script. What it does is adding script tag to document, then remove it later.
globalEval: function( data ) { if ( data && rnotwhite.test(data) ) { // Inspired by code by Andrea Giammarchi // http://webreflection.blogspot.com/2007/08/global-scope-evaluation-and-dom.html var head = document.getElementsByTagName("head")[0] || document.documentElement, script = document.createElement("script"); script.type = "text/javascript"; if ( jQuery.support.scriptEval ) { script.appendChild( document.createTextNode( data ) ); } else { script.text = data; } // Use insertBefore instead of appendChild to circumvent an IE6 bug. // This arises when a base node is used (#2709). head.insertBefore( script, head.firstChild ); head.removeChild( script ); } }, $.globalEval("document.write('<h1>hello</h1>');");