Array.prototype.contains = function (a)
{
  if ("string" == typeof a || "number" == typeof a) {
    for (var b in this) {
      if (a == this [b]) {
        return!0;
      };
    }
  }
  return!1
};

function contains(a, obj) {
 var i = a.length;
 while (i--) {
  if (a[i] === obj) {
   return true;
  }
 }
 return false;
}

Array.prototype.contains = function(obj) {
 var i = this.length;
 while (i--) {
  if (this[i] === obj) {
   return true;
  }
 }
 return false;
}

<div id="div1">
<div id="div2">
jb51.net
</div>
</div>
<script type="text/javascript">
var div1= document.getElementById("div1");
var div2= document.getElementById("div2");
console.log(div1.contains(div2));

var str1="jb51.net";
var str2="jb51";
console.log(str1.contains(str2));
</script>

<div id="div1">
<div id="div2">
jb51.net
</div>
</div>
<script type="text/javascript">
var div1= document.getElementById("div1");
var div2= document.getElementById("div2");
console.log("div1.contains(div2)="+div1.contains(div2));

//字符扩展contains就不会报错了
String.prototype.contains = function(a) {
 return - 1 < this.indexOf(a)
};

var str1="jb51.net";
var str2="jb51";
console.log("str1.contains(str2)="+str1.contains(str2));

//数组扩展contains适用于数组判断
Array.prototype.contains = function(a) {
 if ("string" == typeof a || "number" == typeof a) for (var b in this) if (a == this[b]) return ! 0;
 return ! 1
};

var arr1=["jb51.net","jbzj.com","jb51.com"];
var str3="jb51.net";
console.log("arr1.contains(str3)="+arr1.contains(str3));
</script>

Array.prototype.contains = function(item){
 return RegExp("\\b"+item+"\\b").test(this);
};

Array.prototype.contains = function(obj) {
  var i = this.length;
  while (i--) {
    if (this[i] === obj) {
      return true;
    }
  }
  return false;
}
或
Array.prototype.contains = function(element) {
  for (var i = 0; i < this.length; i++) {
    if (this[i] == element) {
      return true;
    }
  }
  return false;
}
或
Array.prototype.in_array = function(e) {
  for(i=0; i<this.length && this[i]!=e; i++);
  return !(i==this.length);
}


还有一个大牛是这样写的：
Array.prototype.S = String.fromCharCode(2);
Array.prototype.in_array = function(e) {
  var r = new RegExp(this.S+e+this.S);
  return (r.test(this.S+this.join(this.S)+this.S));
}