标签：console log -- JavaScript length arr2 arr1 var 基本操作
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<title>Document</title>
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<body>
<script>
// length获取长度
var arr1 = [1,2,3,4]
console.log(arr1.length)
// 清空数组
arr1.length = 0
console.log(arr1)
// 索引0,1,2,3
var arr2 = ["aa","bb","cc"]
console.log(arr2[0],arr2[1],arr2[2])
// 修改值
arr2[0] = "666666"
console.log(arr2[0])
// 遍历复制
var arr4 = []
var arr3 = [3,4,5,6,7,8]
for(var i = 0;i<arr3.length;i++){
arr4[i] = arr3[i]
}
console.log(arr4)
arr4[0] = "aaaaaaaaaaaaa"
console.log(arr3,arr4)
</script>
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标签：console,
log,
--,
JavaScript,
length,
arr2,
arr1,
var,
基本操作
From： https://blog.csdn.net/weixin_58694594/article/details/142319978