Write a contains function in javascript

Question

Anonymous · Accepted Answer

HTMLElement.prototype.contains = HTMLElement.prototype.contains || function(child) {
    var children;
    var i;
    var node;

    if (this == child) {
      return true;
    }

    if (this.hasChildNodes) {
      for (i = 0, children = this.childNodes; i < children.length; i++) {
        node = children[i];
        // skip for text nodes
        if (node.nodeType === 1 && (node == child || node.contains(child))) {
          return true;
        }
      }
    }

    return false;
  };

Jonathan Calvin · Answer

function contains(needle, haystack) {

  var a = needle, b = haystack,
      result;

  return result = b.indexOf(a) !== -1 ?
    true :
    false;
}

Ivy · Answer

function checkContains()
{
   var url = "this is the answer";
   if(url.indexOf("answer")!=-1)
        alert("contains");
  else alert("not contains");
}

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