join:
作用是將數組轉換爲字符串,其作用和toString()類似但更強,作用與split剛好相反。
例子
比如我們有個字符串"a","b","c"我們要輸出爲a,b,c這樣的格式,那麼我們可以這樣:
var a = ["a","b","c"];
document.write(a);//a,b,c
若使用join,那必須得這樣:
var a = ["a","b","c"].join(",");
document.write(a);//a,b,c
如果你說你要直接輸出abc,而不輸出a,b,c,那使用join再合適不過。
var a = ["a","b","c"].join("");
document.write(a);//abc
其它如
var a = ["a","b","c"].join("@");
document.write(a);//a@b@c
split
var a = a@b@c;
var b = a.split("@");
document.write(b);//a,b,c
**與join作用相反