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if a website does not have jQuery, and we want to use jQuery in chrome console.
You can copy the code from here
http://code.jquery.com/jquery-latest.min.js
paste it into chrome console, then you are good to go.
http://stackoverflow.com/questions/7474354/include-jquery-in-the-javascript-console
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原文地址：http://www.cnblogs.com/phoenix13suns/p/4582255.html
