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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <input type="text" class="back">
  <input type="text" class="back">
  <input type="text" class="back">
  <input type="text" class="back">
</body>
</html>
 
var input = document.querySelectorAll( ".back" );
for( i = 0; i < input.length; i++ ) {
  input[i].oninput = function() {
    if( this.value ) {
      this.style.background = "white";
    }
    else {
      this.style.background = ""; 
    }
  }
}
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Ykro314pro
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