36 lines
901 B
HTML
36 lines
901 B
HTML
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<!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 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=[1,2,3] //字面量
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// console.log(arr[1])
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// for(let i in arr){
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// console.log(arr[i]) // i指代的是数组的下标
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// }
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arr.push(4)
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// var q=arr.pop() //pop 返回的是被删除的那个元素
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// console.log(arr)
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// console.log(q)
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arr.shift() //删除第一个元素
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arr.unshift(6) //往数组首位添加元素
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console.log(arr)
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var str=arr.join(',')
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console.log(str)
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console.log(str.split(','))
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// arr.splice(2,1)
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arr.splice(2,2,9,0)
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console.log(arr)
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// splice() 3 2删除 3修改
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</script>
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</head>
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<body>
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</body>
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</html>
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