字符串

var basic = "abc,def,ghi,";

第一种方法

basic = basic.substr(0, basic.length - 1);

第二种方法

basic = basic.substring(0, basic.length - 1);

第三种方法

basic = basic.substring(0, basic.lastIndexOf(','));

感谢：
https://blog.csdn.net/w200221626/article/details/52231318?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param

原文出处：/show_1EF6NDYLoVV8.html