封装函数进行驼峰命名

<script type="text/javascript">
    
     let str = 'get-element-by-id'

     function trans(ele) {
        let eleArr = ele.split('-')
        let newEle = ''

        eleArr.map((o, i) => {
            if(i > 0) {
                o = o.charAt(0).toUpperCase() + o.slice(1)
            }
            newEle += o
        })

        return newEle
     }

     function trans1(ele) {
        let eleArr = ele.split('-')

        for(let i = 1; i < eleArr.length; i++) {
            eleArr[i] = eleArr[i].charAt(0).toUpperCase() + eleArr[i].substr(1, eleArr[i].length - 1)

        }

        return eleArr.join('')
     }

     console.log(trans(str))
     console.log(trans1(str))

</script>