javascript - Checking for object data

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How do i successfully check if a html object's data is equal to that of a variable on button click? I've tried this but it just seems to be executing the code whether the statement is correct or not.

var FL1 = document.getElementById("FL1Object").data
var Data = 'FL1.png'

document.getElementById("FLLeftBtn").onclick = function() 
FLLeftBtnClicked();

function FLLeftBtnClicked() 
 if (FL1 = Data) 
 alert("Test Successful");
 

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لینک منبع