https://upload-images.jianshu.io/upload_images/5982160-dce35fa31de0a569
//评测题目: 无
1、请写出console结果
setImmediate(function () {
console.log(7)
});
setTimeout(function () {
console.log(1)
}, 0);
process.nextTick(function () {
console.log(6)
process.nextTick(function () {
console.log(8)
})
});
new Promise(function executor(resolve) {
console.log(2);
for (var i = 0; i < 10000; i++) {
i == 9999 && resolve();
}
console.log(3);
}).then(function () {
console.log(4);
});
console.log(5);
//执行队列(同步) 2 3 5 6 8
//任务队列(异步) 4 (1,7)
2、两个有序数组合并成一个有序数组
function sortSTB(arr1,arr2){
2 let index1 = 0,index2 = 0;
3 let result = [];
4 while(index1 !== arr1.length && index2 !== arr2.length){
5 if(arr1[index1] <= arr2[index2]){
6 result.push(arr1[index1]);
7 index1++;
8 }else{
9 result.push(arr2[index2]);
10 index2++;
11 }
12 }
13 if(index1 === arr1.length){
14 result = result.concat(arr2.slice(index2));
15 }else{
16 result = result.concat(arr1.slice(index1));
17 }
18
19 return result;
20 }
3、12345678 ——> 12,345,678
var num=12345678;
var str=num+"";
function rever(str){
return str=str.split("").reserve().join("");
}
str=rever(str)
var result="";
for(var i=1;i result=result+str[i-1]; if(i%3==0&&i!=str.length){ result+="," } } result=rever(result) console.log(result) 4、尽可能多的方法写一下数组去重 //双层循环 var array = [1, 1, '1', '1']; function unique(array) { var res = []; for (var i = 0, arrayLen = array.length; i < arrayLen; i++) { for (var j = 0, resLen = res.length; j < resLen; j++ ) { if (array[i] === res[j]) { break; } } if (j === resLen) { res.push(array[i]) } } return res; } console.log(unique(array)); // [1, "1"] //利用indexOF var array = [1, 1, '1']; function unique(array) { var res = []; for (var i = 0, len = array.length; i < len; i++) { var current = array[i]; if (res.indexOf(current) === -1) { res.push(current) } } return res; } console.log(unique(array)); //ES6 SET var array = [1, 2, 1, 1, '1']; function unique(array) { return Array.from(new Set(array)); } console.log(unique(array)); // [1, 2, "1"] 5、实现继承 //原型链继承 function Cat(){ } Cat.prototype = new Animal(); Cat.prototype.name = 'cat'; var cat = new Cat(); console.log(cat.name); //构造继承 function Cat(name){ Animal.call(this); this.name = name || 'Tom'; } var cat = new Cat(); console.log(cat.name); //拷贝继承 function Cat(name){ var animal = new Animal(); for(var p in animal){ Cat.prototype[p] = animal[p]; } Cat.prototype.name = name || 'Tom'; } var cat = new Cat(); console.log(cat.name);