在javascript中删除字符串中的第二个逗号

let str = "这是,一个,示例,字符串,，要删除的,第二个,逗号";
let arr = str.split(",");

arr.splice(2, 1);

let newStr = arr.join(",");

let str = "这是,一个,示例,字符串,，要删除的,第二个,逗号";
let arr = str.split(",");
arr.splice(2, 1);
let newStr = arr.join(",");
console.log(newStr);