前端笔试题总结

function getNthFibonacci(count) {
    if(count<0) return 0;
    if(count<=1) return 1;
    var first = 1;
    var second = 1;
    var third = 0;
    for(var i = 2; i <= count; i++) {
        third = first + second;
        first = second;
        second = third;
    }
    return third;
}

function getNthFibonacci(count){
    if(count < 2){
        return 1;
    }else{
        return arguments.callee(count - 1) + arguments.callee(count -2)
    }
}

var getNthFibonacci=(function f(count){
    if(count < 2){
        return 1;
    }else{
        return f(count - 1) + f(count -2)
    }
});

<div class="container">
        <div class="header fn-clear">
            <div class="logo">logo</div>
            <div class="username">zhoumingXXX@163.com</div>
        </div>
        <div class="main">
            <div class="side-bar">menu</div>
            <div class="content">左侧内容</div>
        </div>
        <div class="footer">
            footer
        </div>
</div>

body {
    margin: 0;
}
.fn-clear:after {
    content: " ";
    clear: both;
    display: block;
    font-size: 0;
    visibility: hidden;
    height: 0;
}
.fn-clear {
    zoom: 1;
}
.container {
    padding: 10px;
}
.header {
    background: #eee;
    position: relative;
    margin-bottom: 10px;
}
.logo {
    width: 100px;
    height: 100px;
    float: left;
    background: #f60;
}
.username {
    position: absolute;
    right: 10px;
    bottom: 10px;
}
.main {
    margin-bottom: 10px;
}
.side-bar {
    width: 200px;
    float: right;
    background: #ccc;
}
.content {
    margin-right: 200px;
    background: #f6f6f6;
}
.footer {
    background: #999;
}

var line;
while(line=readline()){
    var strs=line.split("");
    var arr=strs.slice(0,strs.length);
    var rev=strs.reverse();
    if(Compare(arr,rev)){
        print("Yes!")
    } else{
        print("No!")
    }
}
//因为这里比较的是字符串，所以比较函数写的较为简单
function Compare(arr1,arr2){
    return (arr1.length==arr2.length)&& arr1.every(function(element,index){
        return element===arr2[index];
    })
}

var str=readline();
var strs=str.split("");
var n=readline();
n=parseInt(n);
for(var i=0;i<n;i++){
    var info=readline()
    info=info.split(" ");
    var l=parseInt(info[0])+parseInt(info[1]);
    var p=parseInt(info[0]);
    strs=Reproduce(strs,p,l);
}
function Reproduce(strs,p,l){
    var length=strs.length;
    var first=strs.slice(0,l);
    var mid=strs.slice(p,l);
    mid=mid.reverse();
    var last=strs.slice(l,length);
    return first.concat(mid,last);
}
print(strs.join().replace(/,/g,""));

var line=readline();
var lines=line.split(" ");
var n=parseInt(lines[0]);
var s=parseInt(lines[1]);
var L=parseInt(lines[2]);
var count=Math.floor((L+1)/(s+1));  //每张cd的歌曲数
var cd=0;
count=Math.min(n,count);   //每张专辑中歌曲数量，不能比歌曲总数多
if(count%13==0){
    count--;
}
cd=Math.floor(n/count);
var yu=n%count;
if(yu!=0){
    cd++;
    if(yu%13==0 && (count-yu)==1){ //在这种情况下必须再多弄一张专辑：倒数第一张必须向倒数第二张专辑借两首歌（如果借一首那么倒数第二张就被13整除了），但是此时倒数第一张专辑只剩一个位置了（如27 27 26）
        cd++;
    }
}
print(cd);