why javascript contains property is not working in chrome browser?

Question

Why javascript contains property is not working in chrome browser? I have tried that Contains Property in javascript.It is working fine in Mozila Firefox Browser. But It is

Answer 1

indexof returns the position of the string. If not found, it will return -1:

var ClearFilterValue = 'family Schools';
alert(ClearFilterValue.indexOf("family") != -1);