Add indexOf to all IE versions under IE9

gistfile1.html

<!--[if lt IE 9]>  -->
<script>
/* if (!Array.prototype.indexOf) { */
    Array.prototype.schmindexOf = function (searchElement /*, fromIndex */ ) {
        "use strict";
        if (this === void 0 || this === null) {
            throw new TypeError();
        }
        var t = Object(this);
        var len = t.length >>> 0;
        if (len === 0) {
            return -1;
        }
        var n = 0;
        if (arguments.length > 0) {
            n = Number(arguments[1]);
            if (n !== n) { // shortcut for verifying if it's NaN
                n = 0;
            } else if (n !== 0 && n !== (1 / 0) && n !== -(1 / 0)) {
                n = (n > 0 || -1) * Math.floor(Math.abs(n));
            }
        }
        if (n >= len) {
            return -1;
        }
        var k = n >= 0 ? n : Math.max(len - Math.abs(n), 0);
        for (; k < len; k++) {
            if (k in t && t[k] === searchElement) {
                return k;
            }
        }
        return -1;
    }

	Array.prototype.bindexOf = function (searchElement , fromIndex) {
        "use strict";
		if(typeof(fromIndex)==='number' && fromIndex==fromIndex) { //catches NaN
			if(fromIndex < 0) {
				fromIndex=this.length + fromIndex;
			} 
		} else {
			fromIndex=0;
		}
		
		for(var i=Math.floor(fromIndex);i<this.length;i++) {
			if(searchElement===this[i]) {
				return i;
			}
		}
		return -1;
    }
/* } */
</script>
<!-- <![endif]-->
<script>
"use strict";
function comp(arr,val,opt) {
	if(arr.schmindexOf(val,opt)!==arr.bindexOf(val,opt) || arr.bindexOf(val,opt) !==arr.indexOf(val,opt)) {
		console.log("DIFFERENCE DETECTED: Index: '"+arr.indexOf(val,opt)+"' Schmindex: '"+arr.schmindexOf(val,opt)+"', Bindex: '"+arr.bindexOf(val,opt)+"' (starting from: "+opt+")");
	} else {
		console.log("PASS - ["+arr.join(",")+"] val: "+val+", (opt: "+opt+")");
	}
}

var poop=['zero','one','two','three','four','five','six'];
var repeat=['a','b','c','a','b','c'];

var testvalues= [
	//Sane values to start with
	[poop,'three'],
	[poop,'five'],
	[poop,'one'],
	
	//some fromIndexChecks
	[repeat,'a',0],
	[repeat,'a',1],
	[repeat,'c',-1],
	[repeat,'b',-4],
	
	//now some false-finds
	[poop,'zoogabie'],
	[repeat,'a',4],
	[repeat,'b',-1],
	
	//now some crazy things
	[poop,'zero',Infinity],
//	[poop,'five',-Infinity], //this one fails in both
	[poop,'two',NaN],
	[poop,'three','fish'],
	[poop,'four',{what: "does",that: "mean"}],
	
	//floats?
	[repeat,'a',0.1],
	[repeat,'a',-4.9],
	[repeat,'a',-3.9],
	[repeat,'c',3.01]
];
//comp(poop,'five',-Infinity);
for(var test in testvalues) {
	comp(testvalues[test][0],testvalues[test][1],testvalues[test][2]);
}
</script>