题解 | #反转数字#

function reverse( x ) {

    let l = 0;
    let flag = 1;
    if(x < 0){
        x = -x;
        flag = -1;
    }
    while(x!=0){
        l=l*10+x%10;
        x=Math.floor(x/10);
    }
    l = flag*l;
    if(l<=Math.pow(2,31)-1 && l>=-Math.pow(2,31)){
        return l;
    }
    else{
        return 0;
    }
}
module.exports = {
    reverse : reverse
};