[TOC] # 1.创建数组的方式 ##1.1字面量 ``` var arr =[1,2,3] ``` ## 1.2构造函数(了解) ``` var arr = new Array(); arr[0] = 1; ``` # 2.数组遍历 ## 1.1 ``` for (let i=0;i<arr.length;i++){ console.log(arr[i]) } ``` ## 1.2 ``` for (let k in arr){ console.log(arr[k]); } ``` ## 1.3 ``` for(let k of arr){ console.log(k); } ``` ## 1.4 ``` arr.forEach((v,k)=>{ console.log(v); console.log(k); }) ```