Join(separator):
不改變原來陣列 ,用separator將陣列內的元素連接成字串。
與 String.split()作用相反 。
var arr = [“A”, “B”, “C”, “D”, “E”];
arr.join(); //A,B,C,D,E ,省略separator則用,作分隔
arr.join()[2]; //B ,還是字串
arr.join(0); //A0B0C0D0E
arr.splice(0)[2]; //B
arr.join(” “); //A B C D E
arr.join(” “)[2]; //B
arr.join(“”); //ABCDE
arr.join(“”)[2]; //C
String.split() 和 Array.join() 也可以拿來替換文字。
var str = “Hi SPLIT, Have A Nice Day.”;
str.split(“a”).join(“~”);
//Hi SPLIT, H~ve A Nice D~y. ,還是字串
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