.contains(key) is not working in ie

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Javascript

hi

When trying excute this i ma gertting error like0x800a01b6 - JavaScript runtime error: Object doesn't support property or method 'contains' but it works in other browser can any one help me out

for (var i = 0; i <= dealVar.length; i++) {
  if (dealVar[i]!=null && dealVar[i].contains('key')) {
    var option = document.createElement('option');
    var str = dealVar[i].split(',');
    var str1 = str[0].split(':');
    var str2 = dealVar[i+1].split(':');

    option.setAttribute('value', str1[1]);

    option.appendChild(document.createTextNode(str2[1]));
    element1.appendChild(option);
  }
}