70 lines
1.5 KiB
HTML
70 lines
1.5 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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<script>
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var arr=[3,9,6,4,5]
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var arr1=[1,'a','p']
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console.log(arr1)
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console.log(arr1[2])
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// 访问数组的时候需要加上数组下标
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// 数组下标从0开始
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// 数组遍历 （用循环输出数组的每一项）
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// for循环
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// for in
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// for(let i=0;i<arr.length;i++){
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// console.log(arr[i])
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// }
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// for(let i in arr1){
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// console.log(arr1[i],i)
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// }
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// 数组的操作
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// 增删改查
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// 增
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var arr2=[1,2,3,4]
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arr2.push('z') //添加一个元素
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// arr2[4]="m"
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arr2.unshift("qq")
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// console.log(arr2[4])
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console.log(arr2,"1234")
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arr2.splice(4,0,'m')
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// 修改
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arr2[3]=5
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arr2.splice(2,1,6)
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// 删除
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arr2.splice(3,1)
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console.log(arr.pop(),"zaza")
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console.log(arr.shift(),"zaza")
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console.log(arr2)
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// 排序
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arr.sort()
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console.log(arr)
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arr.reverse()
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console.log(arr)
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// 转换
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var str=arr.toString()
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// join(',')
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console.log(str)
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console.log(str.split(','))
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</script>
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<body>
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</body>
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</html> |