jquery calls method passing parameters

In jQuery, there are many different ways to pass arguments to functions. This article will introduce some methods of passing parameters in jQuery.

1. Use simple parameters

The easiest way is to add parameters directly after the function name. For example:

$('button').click(function() {
  alert('Hello');
});

This code snippet will pop up a message box every time the button is clicked, and the message box displays the text "Hello".

2. Passing objects as parameters

Sometimes we may need to pass multiple parameters to a function, and these parameters may have certain correlations. At this time, multiple parameters can be encapsulated into an object for transfer. For example:

function showUser(user) {
  alert('User ID: ' + user.id + '
Username: ' + user.username);
}

var user = {
  id: 123,
  username: 'john_doe'
};

$('button').click(function() {
  showUser(user);
});

This code snippet will pop up a message box every time the button is clicked. The message box displays the user's ID and user name.

3. Use the data() method to pass parameters

In addition to explicitly passing parameters, jQuery also provides a way to hide passing parameters. We can use jQuery's data() method to save any data object on the DOM element, and then access the data object saved on the element through the this object in the event handling function. For example:

$('button').data('user', {
  id: 123,
  username: 'john_doe'
}).click(function() {
  var user = $(this).data('user');
  alert('User ID: ' + user.id + '
Username: ' + user.username);
});

This code snippet will pop up a message box every time the button is clicked. The message box displays the user's ID and user name. Here the user object is saved in the userData attribute on the button element. By using the data() method, we can reference this user object through this.

4. Use the call() or apply() method to pass parameters

Sometimes we need to call a function, but we need to manually specify the context in which the function runs. JavaScript provides two functions, the call() and apply() methods, to meet this need. Both methods can pass parameters. For example:

function showMessage(message) {
  alert('Message: ' + message);
}

showMessage.call(null, 'Hello');

This code snippet calls the showMessage function and passes the string "Hello" as a parameter to the function.

Summary

This article introduces some methods of passing parameters in jQuery, including simple parameters, passing objects as parameters, using the data() method to pass parameters, and using call() or apply( ) method to pass parameters. Different methods are suitable for different scenarios, and you need to choose the appropriate method according to the actual situation.

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