<ul> <li>a</li> <li>b</li> <li>c</li> <li>d</li></ul>xxxxxxxxxxul li{ list-style-type: none;}ul li:nth-of-type(2n){ background: red;}ul li:nth-of-type(2n + 1){ background: green;}var f = ( function f(){ return "1"; }, function g(){ return 1243; })()typeof(f);var x =1;if(function f(){}){ x += typeof(f); console.log(x);}