How to use jQuery

First, we have to install jquery, npm install jquery. The installed version is 3.1.0

Next, the first feeling we will use var $ = require('jquery') .

Save the following code as

var $ = require('jquery')
$("body").append("<div>TEST</div>");
($("body").html());

Run node . Tip error:

Error: jQuery requires a window with a document

So what should we do?

existnpm jquery installation package home page, we see that it can be usedjsdom Perform a simulation of a document.

require("jsdom").env("", function(err, window) {
if (err) {
(err);
return;
}
var $ = require("jquery")(window);
$("body").append("<div>TEST</div>");
($("body").html());
});

Run, the result is OK.

One thing that makes me uncomfortable with the above code is that I have to operate in the callback function. So how can we not introduce jquery into the callback function?

var $ = require('jquery')(require("jsdom").jsdom().defaultView);
$("body").append("<div>TEST</div>");
($("body").html());

It runs OK.