Why I can't usr arr.indexOf() with javascript

var dpr="w|n|e|s|sw|nw|ne|se|wd|nd|ed|sd|d|u|wu|nu|eu|su|out|enter"
Note(dpr.split("|").indexOf("wd"))
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I write this js code, but it not running
Who can tell me why

I'm no Javascript expert but it seems that the result of split is an array:

http://www.w3schools.com/jsref/jsref_split.asp