javascript轮换'

javascript替换'
在用javascript替换一个'时是这样:

var a = "test's object.";

a.replace("'","\\'");


如果a变量的值变成: "test''s object."时.

该如何替换成这样: test\'\' object. 

?? 谢.



[解决办法]
var a = "test''s object.";
var b = a.replace(/'/g,"\\'");
alert(b);