function convertToBinary(num) { let newnum = num.toString(2); let length = num.toString(2).length; let a; if(length < 8){ a = 8 - length; let b = new Array(a); return b.fill(0).join() + newnum; } return newnum; }

function commonParentNode(oNode1, oNode2) { if(oNode1.contains(oNode2)){ return oNode1; }else{ return commonParentNode(oNode1.parentNode,oNode2); } }

            const _isPalindrome = string => {                // 补全代码                let a = [...string];                let b = [...string];                for(let e in a){                    if(e = b.pop){                        return true;                    }                    return false; ...

const _isSameSet = (s1, s2) => { for(let i = 0; i <s1.length; i++){ if( !s2.indexOf(s1[i])) return false; } return true; }