笨小孩

摘要：一维数组去重 let arr = [1,2,3,4,5,4,,3,2,1] let set = new Set() arr.forEach((item)=> set.add(item)) let a = Array.from(set) console.log(a) //[1,2,3,4,5] 二维数 阅读全文

摘要：let num1 = 708 let arr = [] let str = String(num1) //数字转字符串 for (let q=0; q<str.length; q++){ arr[q] = str[q] //字符串存入数组 } console.log(arr) //["7", "0" 阅读全文

摘要：数字数组转数字（整型） let l1 = [2,4,3] let num1 = parseInt(l1.join("")) console.log(num1) //243 数字数组转数字（浮点型） let l2 = [2, ".", 3] let num2 = parseFloat(l2.join( 阅读全文