javascript - getElementsByTagName is not a function -


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i struggling this. wanting change src attribute of img tag , error message getelementsbytagname not function. following test markup

<html> <body> <div class="logo"> <img src="/a.jpg"> </div> <script> document.getelementsbyclassname('logo').getelementsbytagname('img')[0].src ="/b.jpg"; </script> </body> </html>

any advice appreciated.

getelementsbyclassname return collection. have : 

document.getelementsbyclassname('logo')[0].getelementsbytagname('img')[0].src ="/b.jpg";

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