JavaScript gets the ID element

function $ (ID) {

return document.getElementById (ID);

}

The document.getElementById (ID) is the element that obtains the ID.

The equivalent of defining a method that uses $ ("ID0") to get the control with ID id0.

And this definition is only used in projects that don't have jquery, and when you use $ and then jquery, all your code about jquery is useless, so here we

Do not be fooled by his $, this is just a variable name, casually take, you use x also line, so use is X ("Id0").

Change the above code to the following code, and you will change the $ x to

function x (ID) {

return document.getElementById (ID);

}

$ is the operator inside jquery

JavaScript gets the ID element