JavaScript rounding to 1 decimal place on inline style attribute -

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I have a function that is generating random RGBA colors and if I log in to the console then it's decimal Rotates at the place (what I want to do), but if you open the console and view it as an inline style feature on the body element, can you see that it is moving in a decimal place? where is the problem? 

  setInterval (function fu () {document.body.style.backgroundColor = ("RGBA (+ + Mathrade). () * 255) +" , "+ Math.round (Math.random (* * 255) +", "+ Math.round (Math.random (* * 255) +", + + Math.random (). Tofix (1)) + " ) ";}, 1000);  
  JS   
  setInterval (function foo () {console.log (("rgba ("+ Math.round (Math.random (* * 255) +", "+ Math.round (Math.random (* * 255) +", + Math.round (Math.random (* * 255) + "," + Math.random (. ToFixed (1)) + ")");}, 1000);   
 If you compare these two fiddles then you see the difference Why are they different? It is a similar task and it should be equal, right?   
 
 
 Browser internally stores alpha values ​​as 1 byte, not in the form of a float. For example When you say that you need 0.5 alpha, then the browser converts it to 1 byte integer using:  
  Math. Floor (255 * 0.5)   
 When you say the result back, it will change the integer by dividing it by 0 to 0.  
 This will be the wrong alpha I tested it using:  Color    by RGBA (134, 78, 73,0,5) // javascript RGBA (134, 78, 73, 0.498039) Re> 
  0.498039 = Math.floor (255 * 0.5) / 255;  (with some rounding at all)

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