摘要: 一、声明后未赋值,表现相同 https://blog.csdn.net/lyc2786161648/article/details/86429375 var varTest; let letTest; console.log(varTest); //输出undefined console.log(l 阅读全文
posted @ 2021-06-07 15:41 双手插在裤兜谁也不爱 阅读(88) 评论(0) 推荐(0)