자바스크립트 여러가지

//Using hasOwnProperty to build resilient object looping.
Object.prototype.otherKey = "otherValue";
var object = { key: "value" };
for ( var prop in object ) {
    if ( object.hasOwnProperty( prop ) ) {
        assert( prop, "key","There should only be one iterated property." );
    }
}

//XPath
if ( typeof document.evaluate === "function" ) {
    function getElementsByXPath(expression, parentElement) {
        var results = [];
        var query = document.evaluate(expression,parentElement || document,null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
        for (var i = 0, length = query.snapshotLength; i < length; i++)
            results.push(query.snapshotItem(i));
        return results;
    }
}