第六次笔记

2022/2/11 6:15:13

编程Tag： var console 笔记 log arr2 第六次 arr5 arr3

本文主要是介绍第六次笔记，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

【优极限】 HTML+CSS+JavaScript+jQuery前端必学教程，小白教学，前端基础全套完成版_哔哩哔哩_bilibili<!DOCTYPE html>
<html>
   <head>
       <meta charset="utf-8" />
       <title>类型转换</title>
   </head>
   <body>
       <script type="text/javascript">
   console.log("==========");
       console.log(1=='1');
       console.log(1==='1');
       var arr1 = [];
       console.log(arr1);
       var arr2 =[1,2,'a',true];
       console.log(arr2);
       var arr3 = new Array(1,2,3);
       console.log(arr3);
       var arr4 = new Array(5);
       console.log(arr4);



       console.log("==========");
       console.log(arr2[1]);
       console.log(arr2[10]);
       arr2[1]=20;
       console.log(arr2);
       arr2[10] = 100;

       console.log(arr3.lenght);
       arr3.length = 5;
       console.log(arr3);
       arr3.name = "zhangsan";
       console.log(arr3);
       arr3["pwd"]="123456";
       console.log(arr3);
       console.log(arr3["name"]);



       console.log("==========");
       console.log(arr3);
       console.log("for遍历循环");
       for(var i =0; i<arr3.length;i++) {
           console.log("下标:" +i+ "值："+arr3[i] );

       }
       console.log("---for...in----");
       for (var i in arr3){
           console.log("下标：" +i+ "值："+arr3[1]);
       }
       console.log("---forEach----")
               arr3.forEach(function(element,index){
                   console.log("下标：" +index+"值："+element);
               })


                   console.log("==========");
                   var arr5 =["a","b","c"];
                   arr5[arr5.length]="d";
                   arr5.push("e")
                   console.log(arr5);
                   console.log(arr5.indexOf("a"));
                   console.log(arr5.indexOf("t"));
                   console.log(arr5.join("-"));
                   var str = "1,2,3,4,5";
                   console.log(str.split(","));


                   function fn01(a,b){
                       console.log(a+b);
                   }
                   console.log(fn01);
                   var fn02 =function(a,b){
                       console.log(a+b);
                   }
                   var fn03 = new Function("a","b","return (a+b)");
                   function fn04(a,b){
                       return (a+b);
                   }






   </script>
   </body>
</html>

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第六次笔记

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