MediaQueryList.removeListener() - Web APIs 编辑

The removeListener() method of the MediaQueryList interface removes a listener from the MediaQueryListener.

This is basically an alias of EventTarget.removeEventListener(), for backwards compatibility purposes — in older browsers you could use removeEventListener() instead.

Syntax

MediaQueryList.removeListener(func)

Parameters

func

A function or function reference representing the callback function you want to remove.

Return value

Void.

Example

var paragraph = document.querySelector('p');
var mediaQueryList = window.matchMedia('(max-width: 600px)');

function screenTest(e) {
  if (e.matches) {
    /* the viewport is 600 pixels wide or less */
    paragraph.textContent = 'This is a narrow screen — 600px wide or less.';
    document.body.style.backgroundColor = 'pink';
  } else {
    /* the viewport is more than than 600 pixels wide */
    paragraph.textContent = 'This is a wide screen — more than 600px wide.';
    document.body.style.backgroundColor = 'aquamarine';
  }
}

mediaQueryList.addListener(screenTest);

// Later on, when it is no longer needed
mediaQueryList.removeListener(screenTest);

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• Media queries
• Using media queries from code
• window.matchMedia()
• MediaQueryList
• MediaQueryListEvent