阿里笔试题

1.

class Cash {    constructor(cash) {        this.cash = cash;        var fen = cash%100;        var jiao = (cash/10)%10;        var yuan = (cash/100);        this.reCash = `${yuan}元${jiao}角${fen}分`;    }    add (obj1,obj2) {        return reCash;    }};

var cash1 =new Cash(105);
var cash2 = new Cash(66);
var cash3 = cash1.add(cash2);
var cash4 = cash1.add(cash1，cash2);
var cash5 = new Cash(cash1+cash2);
console.log(${cash1},${cash2},${cash3});

2.在用户体验良好的基础上，采集页面所有的ajax请求的返回状态和响应时间。

3.用户自定义事件机制
实现on，可给对象绑定多个函数，且函数能多次触发。
emit方法：只绑定一个，且只触发一次。

4.IE11中可以使用 Promise对象。
5.A>B 表示选择A元素的所有子B元素。(直接子元素)
与A B的区别在于，A B选择所有后代元素，而A>B只选择一代。
6.

 /[ABCD]{2,3}[a-z0-9]+/.test("CDEv");  /[ABCD]{2,3}[a-z0-9]+/.test("ABD5");  /[ABCD]{2,3}[a-z0-9]+/.test("CCab");   /[ABCD]{2,3}[a-z0-9]+/.test("CD1");    /[ABCD]{2,3}[a-z0-9]+/.test("BC");

7.

(4>=4)&&(5<=2)[1,2,3].splice(1,1,2,3,4)/[."]*/.test("http://image.163.com")/[^"]*/.test("http://image.163.com")true&& 00&&'s'

8.window.document
window.self
window.history
window.message

9.null == undefined
obj1 === obj2
var obj2 = new String(“1”);
var obj1 = new String(“1”);

window.history.pushState(null, null, “/name/orange”);

(function (a) {return this.value+a;}).bind({value:2}).call({value:3},4,5)

function f(a,b,c){console.log(arguments.callee.length);}

({x:0}==false)?true:false
{x:0}==false?true:false
[0]==false?true:false
([0])?true:false

var a=[];
typeof a

var taskk=[];for(var i=0;i<5;i++){    ((j)=>{            taskk.push(new Promise((resolve)=>{                   setTimeout(()=>{                       console.log(new Date,j);                       resolve();                   },1000*j)                }            ));          }    )(i)}Promise.race(taskk).then(    ()=>{        setTimeout(()=>{            console.log(new Date,i);        },0);    });

const task=[];for(var i=0;i<5;i++){    ((j)=>{            task.push(new Promise((resolve)=>{                   setTimeout(()=>{                       console.log(new Date,j);                       resolve();                   },1000*j)                }            ));          }    )(i)}Promise.race(task).then(    ()=>{        setTimeout(()=>{            console.log(new Date,i);        },0);    })

const task=[];for(var i=0;i<5;i++){    ((j)=>{            task.push(new Promise((resolve)=>{                   setTimeout(()=>{                       console.log(new Date,j);                       resolve();                   },1000*j)                }            ));          }    )(i)}Promise.race(task).then(    ()=>{        setTimeout(()=>{            console.log(new Date,i);        },2000);    })

const tasks=[];for(var i=0;i<5;i++){    ((j)=>{            tasks.push(new Promise((resolve)=>{                   setTimeout(()=>{                       console.log(new Date,j);                       resolve();                   },1000*j)                }            ));          }    )(i)}Promise.race(tasks).then(    ()=>{        setTimeout(()=>{            console.log(new Date,i);        },0);    })

const tasks=[];for(var i=0;i<5;i++){    ((j)=>{            tasks.push(new Promise((resolve)=>{                   setTimeout(()=>{                       console.log(new Date,j);                       resolve();                   },1000*j)                }            ));          }    )(i)}Promise.race(tasks).then(    ()=>{        setTimeout(()=>{            console.log(new Date,i);        },1000);    })

var task=[];for(var i=0;i<5;i++){    ((j)=>{            task.push(new Promise((resolve)=>{                   setTimeout(()=>{                       console.log(new Date,j);                       resolve();                   },1000*j)                }            ));          }    )(i)}Promise.race(task).then(    ()=>{        setTimeout(()=>{            console.log(new Date,i);        },0);    });

const task=[];for(var i=0;i<5;i++){    ((j)=>{            task.push(new Promise((resolve)=>{                   setTimeout(()=>{                       console.log(new Date,j);                       resolve();                   },1000*j)                }            ));          }    )(i)}Promise.race(task).then(    ()=>{        setTimeout(()=>{            console.log(new Date,i);        },0);    })

window.onhashchange=function(){console.log('hash change');}window.history.pushState(null, null, "https://www.baidu.com/?name=orange");

window.onhashchange=function(){console.log('hash change');}window.history.pushState(null, null, "https://segmentfaulcom/a/11900000072389/?name=orange");

window.onhashchange=function(){console.log('hash change');}window.history.pushState(null, null, "https://segmentfaulcom/a/name=orange");

window.onhashchange=function(){console.log('hash change');}window.history.pushState(null, null, "https://segmentfaulcom/a/11900000072389?name=orange");

window.onhashchange=function(){console.log('hash change');}window.history.pushState(null, null, "https://segmentfaulcom/name=orange");window.history.pushState(null, null, "?name=orange");window.onpopstate=function(){console.log("1");}window.history.pushState(null, null, "/name/orange");

7.

for(const i=0;i<5;i++){    setTimeout(function () {        console.log(i);    },i*1000);}

setTimeout(function() {  console.log(1)}, 0);new Promise(function executor(resolve) {  console.log(2);  for( var i=0 ; i<10000 ; i++ ) {    i == 9999 ;  }  console.log(3);}).then(function() {  console.log(4);});console.log(5);

for (var i = 0; i < 5; i++) {  setTimeout((function(i) {    console.log(i);  })(i), i * 1000);}

for(var i=0;i<5;i++){    (function (k) {        setTimeout(function () {            console.log(new Date,k);        },k*1000);    })(i);}

for(var i=0;i<5;i++){    setTimeout(function () {        console.log(new Date,i);    },1000);}console.log(new Date,i);

'meitu'.substr(-3,2)

console.log(1);setTimeout(function(){  console.log(2);},10);console.log(3);setTimeout(function(){  console.log(4);},0)

document.onfocusdocument.toggleClass()

document.cookie.replace(/;\s+/gim,"\",\"").              replace(/=/gim, "\":\"")JSON.parse("{\"+ document.cookie.replace(/;\s+/gim,"\",\"").              replace(/=/gim, "\":\"") +\"}") document.cookie.replace(/=/gim, "\":\"") document.cookie.replace(/;\s+/gim,"\",\"") "{\""+ document.cookie.replace(/;\s+/gim,"\",\"").              replace(/=/gim, "\":\"") +"\"}" JSON.parse("{\""+ document.cookie.replace(/;\s+/gim,"\",\"").              replace(/=/gim, "\":\"") +"\"}") 

"{\"  +\"}"\""  + "\"\""

var s=1;function p(s){  var s;  console.log(s);  s=3;}p(2);

(50|2)==50let arr=[1..100]let add=a=>b=>a+blet {document:d0c,fetch}=windowlet {document:dpc.fetch}=window[].push(...[1,2])

var person="ni";person.age=27;console.log(person.age);

console.log(0);var promise=new promise(function(resolve,reject){  console.log(1);  setTimeout(function(){    resolve();    console.log(2);  },1000)})console.log(3);promise.then(function(){  console.log(4)},function(){  console.log(5)})

function h(){  var arr=[];  for(var i=0;i<10;i++){    arr[i]=function(){      return i;    };  }  return arr;}console.log(h()[1]());

Date.parse("1900-01-01");encodeURI('http://m.ctrip.com?a=1&b=2')

function f(n){  for(var i=n;i>=0;i--){    setTimeout(function(){      console.log(i);    });  }}f(3)

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