摘要: var str="Hello world!"; var n=str.slice(-2); var str="Hello world!"; var n=str.slice(0, 2); var str="Hello world!"; var n=str.slice(6, 8); 阅读全文
posted @ 2020-03-19 11:20 1156740846 阅读(490) 评论(0) 推荐(0) 编辑