标签：rgb console div color bsp 未定义 === aaa style
变量未定义时，
其被赋为undefined
let aaa; console.log("undefined ...",undefined); console.log("aaa ...", aaa); if(aaa==undefined){ console.log("aaa == undefined" ); } if(aaa===undefined){ console.log("aaa === undefined") }
标签：rgb console div color bsp 未定义 === aaa style
原文地址：https://www.cnblogs.com/zhishiyv/p/15038740.html
