JS计算平均值的简单例子

<asp:TextBox ID="tblmyd11" Field="lmyd11" TableName="gqls_sy" EnabledAction="(12.*)"  CssClass="erp_textbox_short" runat="server" self="ydpj"></asp:TextBox>

/******硬度HRC平均值******/
 $(function() {
     $("[self='ydpj']").blur(function() { Getlmpj("11", "21", "31", "41"); });
     $("[self='ydpj']").blur(function() { Getlmpj("12", "22", "32", "42"); });
     $("[self='ydpj']").blur(function() { Getlmpj("13", "23", "33", "43"); });
     $("[self='ydpj']").blur(function() { Getlmpj("14", "24", "34", "44"); });
     //螺母
     function Getlmpj(one, two, three, four) {
  var avg = 0;
  var num1 = ChangeFloat($("input[id*=tblmyd" + one + "]").val());
  var num2 = ChangeFloat($("input[id*=tblmyd" + two + "]").val());
  var num3 = ChangeFloat($("input[id*=tblmyd" + three + "]").val());
  if (num1 != 0 && num2 != 0 && num3 != 0) {
      avg = (num1 + num2 + num3) / 3;
      $("input[id*=tblmyd" + four + "]").val(RoundValue(avg, 0.1, 1));
  }
  else { // www.jb200.com
      $("input[id*=tblmyd" + four + "]").val("");
  }
     }
 });
function ChangeFloat(data) {
     if (data != null && data != "") {
  return parseFloat(data);
     }
     else {
  return 0;
     }
 }