<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>评分效果</title><script src="../js/jquery.min.js"></script><style>ul li{padding: 0;list-style: none}li{width: 30px;height: 30px;border: 1px solid #333;float: left;margin-right: 10px}</style></head><body><ul class="ul01"><li></li><li></li><li></li><li></li></ul><script>$(function(){$("li").on({mouseover:function(){if($(this).css("backgroundColor") == '#ff0000'){$(this).css("background","");console.log($(this).css("backgroundColor"))}else{$(this).css("background","red").prevAll("li").css("background","red");console.log($(this).css("backgroundColor"))}},mouseout: function(){$(this).css("background","")},click: function(){$(this).off("mouseout")$(this).css("background","red").prevAll("li").css("background","red");}})})</script></body></html>