why javascript contains property is not working in chrome browser?

Contains() Property in javascript.,it is working fine in Mozila Firebox only.It will not support Chrome Browser,Internet Browser,Safari,Opera browser.

Mozila Browser :

  var ClearFilterValue  = 'family Schools';
    if(ClearFilterValue.contains("family")== true) {
   alert('Success');
    } 
  

Chorme & Mozila Firebox Browser :

    The below javascript index() properity will working for both chrome and mozile firbox.It is functionality similar to contains property.

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

var n  =   str.indexOf("family"); 
if(n >= 0) { 
    alert(success); 
}

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