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52、数组操作-删 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> let arr = [1,2,3] // 删除最后一个元素 // arr.pop() // // console.log(arr.pop()) // 3 // console.log(arr) // 2、删除第一个元素 // arr.shift() // console.log(arr) // 3、删除指定元素 splice splice(起始位置-索引号，删除几个) arr.splice(1, 1) console.log(arr) </script> </body> </html> -
51、数组去0案例 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> let arr = [2,0,6,1,77,0,52,0,25,7] // 1、声明一个新数组 let newArr = [] // 遍历筛选 for (let i = 0; i < arr.length; i++){ if (arr[i] !== 0){ newArr.push(arr[i]) } } console.log(newArr) </script> </body> </html>
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50、数组筛选 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> // // 重点案例 // let arr = [2,0,6,1,77,9,54,3,78,7] // // 1、声明新的空的数组 // let newArr = [] // // 2、遍历就数组 // for (let i = 0; i < arr.length; i++){ // if (arr[i] >= 10){ // // 3、满足条件追加给新的数组 // newArr.push(arr[i]) // } // } // // 4、输出新的数组 // console.log(newArr) let arr = [10,20,30,1,2,3] let newArr = [] for (let i = 0; i < arr.length; i++){ if(arr[i] >= 10){ newArr.push(arr[i]) } } console.log(newArr) </script> </body> </html>
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49、数组操作-新增 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> let arr = ['pink','hotpink'] // 新增 push 推末尾 // console.log(arr.push('deeppink')) // 3 // arr.push('deeppink', 'linghtpink') // console.log(arr) // 开头追加 arr.unshift('red') console.log(arr) </script> </body> </html>
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48、数组操作-改 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> // let arr = [] // console.log(arr) // // console.log(arr[0]) //undefined // arr[0] = 1 // console.log(arr) let arr = ['pink','red','green'] // 修改 // arr[0] = 'hotpink' // console.log(arr) // 给所有数组元素后面加个老师 for (let i = 0; i < arr.length; i++){ arr[i] = arr[i] + '老师' } console.log(arr) </script> </body> </html>
