js_21 数组连接、截取、替换
2018-11-22 本文已影响0人
basicGeek
<!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
