js_21 数组连接、截取、替换

作者: basicGeek | 来源:发表于2018-11-22 11:25 被阅读0次

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<script>

    var arr1 = ["a","b","c"];
    var arr2 = [1,2,3];

    //concat把数组链接在一起
    var arr3 = arr1.concat(arr2);
    console.log(arr1);
    console.log(arr2);
    console.log(arr3);

    //slice数组的截取
//    var arr4 = arr3.slice(2);["c",1,2,3]
//    var arr4 = arr3.slice(-2);[2,3]
//    var arr4 = arr3.slice(4,2);//[]
//    var arr4 = arr3.slice(2,4);//["c", 1]索引值包括坐标的不包括右边的。
//    console.log(arr3);
//    console.log(arr4);

    //splice操作和截取原数组
    var arr5 = ["关羽","关羽","关羽"];
    //替换的元素不能是以数组形式存在，否则将整个数组放进原数组中。
    var arr4 = arr3.splice(0,3,"关羽","关羽","关羽");
    console.log(arr3);
    console.log(arr4);

</script>
</body>
</html>

数组截取、替换