Javascript split and indexOf

var location1= ((location.href).split('?')[0]).split('/').pop();
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var indexStart = elem.docIcon.indexOf("http");//grabbing the url
var indexEnd = elem.docIcon.indexOf("jpg");//grabbing the url
indexEnd += 3;//grabbing the url
var docIcon = elem.docIcon.substring(indexStart, indexEnd);//setting the url
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