SOURCE

/*function getNum(max,min){
    return Math.floor(Math.random()*(max-min+1)+min);
}
var rightNum = getNum(1,50);
console.log(rightNum);


for(i=9;i>=0;i--){
    var useNum = prompt('请输入1-50之间的整数')
    if (useNum>rightNum){
alert('你猜大了，还剩'+i+'次机会');
}else if (useNum<rightNum){
    alert('你猜小了，还剩'+i+'次机会');
}else{
    alert('猜对了，你太幸运了');
    break;
}
}*/

/*var date = new Date();
console.log(date);

var date1 = new Date(1999,6,10);
console.log(date1);

var date2 = new Date('1999-7-9 7:9:7');
console.log(date2);

var year = date.getFullYear();
var mon =date.getMonth()+1;
var day = date.getDate();
var zhou =date.getDay();
var arr =['星期日','星期一','星期二','星期三','星期四','星期五','星期六']
console.log('今天是'+year+'年'+mon + '月'+day +'日 '+arr[zhou]);*/

//倒计时
function cutdown(time){
var arr = +new Date();
var usetime = +new Date(time);
var time2 = (usetime-arr)/1000;
var d = parseInt(time2/60/60/24);
var h = parseInt(time2/60/60%24);
var m = parseInt(time2/60%60);
var s =parseInt(time2%60);
d = d<10? '0'+d:d;
h = h<10? '0'+h:h;
m = m<10? '0'+m:m;
s = s<10? '0'+s:s;
return d+'天'+h+'小时'+m+'分'+s+'秒'
}

console.log(cutdown('2021-11-29 21:11:29'));



function daoxu(arrs){
    if(Array.isArray(arr3)){
       var arr1 = [];
     var arr2 = new Array;
     for(i=0;i<arrs.length;i++){
         arr2[i] = arrs[arrs.length-i-1];
         
     }return arr2;
    }else{
        console.log('error 参数不是数组')
    }
}

console.log(daoxu(3,2,1));

var arr3 = ['',1,3] ;
console.log(Array.isArray(arr3))
console.log(arr3 instanceof Array)

var arr4 = ['jtt','qll'];
arr4.push('hqyz');
console.log(arr4.push('hqyz'));
console.log(arr4);
arr4.unshift('hqsy');
console.log(arr4);

arr4.pop();
console.log(arr4);
console.log(arr4.pop());

arr4.reverse();
console.log(arr4);

var arr5 = [24,51,2,35,7];
max = '';
for(i=0;i<arr5.length;i++){
    for(j=0;j<arr5.length;j++){
         if(arr5[j]>arr5[j+1]){
             max = arr5[j];
             arr5[j] = arr5[j+1];
             arr5[j+1] = max;
         }
    }
}
console.log(arr5);

var arr6 = [24,51,2,35,7];
arr6.sort(function(a,b){
    return b- a;
})
console.log(arr6);
console.log(arr6.indexOf(12));

function unique(arr7){
    arr8 = [];
    for(i=0;i<arr7.length;i++){
        if (arr8.indexOf(arr7[i]) == -1){
            arr8.push(arr7[i]);
        }
    }return arr8 ;
}
console.log(unique(['c','a','z','a','x','a','x','c','b']));

var arr9 =[1,2,3];
console.log(arr9.toString());

var str = 'abcoefoxzyozzopp';
var arr10 = []; //存放o的位置与计算o的次数
for (i=0;i<str.length;i++){
if (str.indexOf('o',i) != '-1' && arr10.indexOf(str.indexOf('o',i)) == -1 ){
    arr10.push(str.indexOf('o',i));
}
}


console.log(arr10);
console.log(arr10.length);