js计算小数，小数部分小于0.5按0.5来，大于0.5按1来

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  ttt5

  var x = 10.98765432;
  var zs = parseInt( x );
  var xs = x - zs;
  if ( xs <= 0.5 ) {
    xs = 0.5;
  } else {
    zs++;
    xs = 0;
  }
  x = zs + xs;

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