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As you already know,jQuery uses the $ sign as a shortcut for jQuery.There are many other popular JavaScript frameworks like: Angular, Backbone, Ember, Knockout, and more.If two different frameworks are using the same shortcut, one of them might stop working.The jQuery team have already thought about this, and implemented the noConflict() method
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<script>
var jq = $.noConflict();
jq(document).ready(function(){
jq("button").click(function(){
jq("p").text("jQuery is still working!");
});
});
</script>