function changeStr(str = ‘hello-world-aaaa‘){
let s = ‘‘
let arr = str.split(‘-‘)
for(let i = 0;i < arr.length;i++){
let item = arr[i]
item = item.replace(item[0],item[0].toUpperCase())
s += item
}
return s
}
原文：https://www.cnblogs.com/zhenjianyu/p/13341982.html