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Properties of DOM

2022-06-25 01:16:00 【Lutrra】 

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    <script> // object  function Person(name,age){
       this.name=name, this.age=age } var obj_2=[{
      name:' Li Si ',age:18},{
      name:' Wang Wu ',age:18},{
      name:' Zhao Liu ',age:18}]; var obj_1=new Person(" Zhang San ",18); console.log(obj_1); for(var i in obj_2){
       console.log(obj_2[i].name); } // Built-in objects  //1. Mathematical functions  var a=Math.PI; console.log(' Mathematical functions ：PI:'+a); var b=-1; var number=Math.abs(b); console.log(' Mathematical functions ：abs:'+number); var r=Math.random(); console.log(' Mathematical functions ：random:'+r); var round=Math.round(a); console.log(' Mathematical functions ：round:'+round); var ceil=Math.ceil(a); console.log(' Mathematical functions ：ceil:'+ceil); var ceil=Math.floor(a); console.log(' Mathematical functions ：floor:'+ceil); // continuity  function getTenNumber(){
       console.log("------- Consecutive numbers -----------------") console.log('') var num=Math.floor(Math.random()*71+1); for(var i=0;i<10;i++){
       num=num+1; console.log(num%71+1); } } getTenNumber(); // Random number  var stu=[]; function getNumber(){
       //includes push pop  console.log("------- Random number -----------------") while(stu.length<10){
       var rand=Math.random()*71+1; var result=Math.floor(rand); if(stu.includes(result)){
       continue; }else{
       stu.push(result) } } stu.forEach(element => {
       console.log(element) }); } getNumber(); //2.data var data=new Date(); console.log(data.getFullYear()+' year '); console.log(data.getMonth()+' month '); console.log(data.getDay()+' Japan '); console.log(data.getHours()+' when '); console.log(data.getMinutes()+' branch '); console.log(data.getSeconds()+' second '); console.log(data.getTime()+' And 19 The number of milliseconds from several years '); console.log(data.getDate()+' Days '); console.log(data); console.log("-------------") var data_2=new Date("2021-10-20 00:00:00"); var time=data_2-data; var day=Math.floor(time/1000/60/60/24); var hour=Math.floor(time/1000/60/60%24); var min=Math.floor(time/1000/60%60); var second=Math.floor(time/1000%60); console.log("------- The rest of the time ------") console.log(day+' Japan '+hour+' when '+min+' branch '+second+' second ') // character string  var str="abcdefg"; console.log(str.charAt(5))// Subscript to be 5 console.log(str.lastIndexOf('a'));// Retrieve from behind , Return from the past  console.log(str.includes('ab')); console.log(str.replace(/a/g,'A')); var str_num="1,2,3,4" console.log(str_num.split(',')); console.log(str.substring(2,5));// Subscript - Where to go?  // Array  var array_1=[1,2,3,4,5]; array_1.push(6) console.log(array_1); array_1.pop(6) array_1.reverse(); array_1.sort(function (a,b) {
       return a-b; // positive sequence   });// seeds  obj_2.sort(function (a,b) {
       return a.age-b.age; }) console.log(obj_2); var str=array_1.join('+'); console.log(str); array_1.forEach(function (item,index) {
       console.log(index+''+item); }) array_1.splice(0,2)// In fact, the subscript , How many? , Insert  </script>
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本文为[Lutrra]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/02/202202210541310001.html

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