<script>
var arr1 = ["red", "green", "blue"];
arr1[2] = "pink"; //覆盖掉索引号2的值;
console.log(arr1);
arr1[3] = "black"; //输入没有占用的索引号会添加新元素
console.log(arr1);
</script>
新增数组元素 用修改索引号 追加数组元素
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<script>
var arr1 = ["red", "green", "blue"];
arr1[2] = "pink"; //覆盖掉索引号2的值;
console.log(arr1);
arr1[3] = "black"; //输入没有占用的索引号会添加新元素
console.log(arr1);
</script>
新增数组元素 用修改索引号 追加数组元素
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