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What is the meaning of “$” sign in JavaScript
Now this must seem to be an easy and stupid question to ask but I must know why we use the dollar ($) symbol in jQuery and JavaScript.
I always put a dollar in my scripts but I actuary don't know why.
例如:
$('#Text').click(function () {
$('#Text').css('color', 'red')
});
这只是改变了文本的 colored颜色 ，当你点击它，但它证明了我的观点.
In JavaScript it has no special significance (no more than a or Q anyway). It is just an uninformative variable name.
In jQuery the variable is assigned a copy of the jQuery function. This function is heavily overloaded and means half a dozen different things depending on what arguments it is passed. In this particular example you are passing it a string that contains a selector, so the function means "Create a jQuery object containing the element with the id Text".