js删除字符串的最后一个字符三种方法 字符串 [javascript] view plain copy var basic = "abc,def,ghi,"; 第一种 [javascript] view plain copy basic = basic.substr(0, basic.length - 1); 第二种 [javascript] view plain copy basic = basic.substring(0, basic.length - 1); 第三种 [javascript] view plain copy basic = basic.substring(0, basic.lastIndexOf(','));