//将字符串转为驼峰命名‘foo-bar-car-day-efg’

function toUpperCase(str){

    var string=str.split('-');

    var arr=[];

    arr.push(string[0]);

    for(var i=1;i<string.length;i++){

        arr.push(string[i].toString()[0].toUpperCase()

                    +string[i].toString().slice(1))

    }

    return arr.join('')

}

document.write(toUpperCase(‘foo-bar-car-day-efg’))