运行函数的条件语句？

Question

我有一些js在移动时运行。当浏览器高于768时，此功能不应运行。还有办法在vanilla js中恢复一个追加方法吗？

if (window.innerWidth < 768 ) {
    mobileNav();
} else {

}

Answer 1

使用此条件添加和删除手机菜单

＆＃13;

＆＃13;

var breakpoint = matchMedia("(min-width: 400px)")
var message1 = document.createElement('p')
var message2 = document.createElement('p')

message1.innerText = 'the viewport is at least 400 pixels wide'
message2.innerText = 'the viewport is less than 400 pixels wide'

function render() {
    if (breakpoint.matches) {
      // the viewport is at least 400 pixels wide
      // add mobileNav()
      message2.remove()
      document.body.append(message1)
    } else {
      // the viewport is less than 400 pixels wide
      // remove mobile nav
      message1.remove()
      document.body.append(message2)
    }
}

render() // render initial
breakpoint.onchange = render // as well on changes

＆＃13;

＆＃13;

＆＃13;