页面计算的问题


<form id="newForm" name="newForm"><table width="65%" align="center" class="t1" border="1" cellspacing="0" cellpadding="0" id='newtable'><tr>
    <th nowrap="nowrap" colspan="8" width="65%" background="<c:url value="/images/head.gif"/>"><font
            color="blue" size="2">一炼铁部</font></th>
</tr>
<tr>
    <th nowrap="nowrap" width="8%" background="<c:url value="/images/head.gif"/>"><font
            size="2">1#入炉烧结矿</font></th>
    <td nowrap="nowrap" width="8%" align="center"><font size="2"><input type="text" id="ylt_rlsjk1" name="ylt_rlsjk1"
                                                                        value="${yjrbph.ylt_rlsjk1}"
                                                                        onafterpaste="value=value.replace(/[^\d\.]/g,'')"
                                                                        style="width:80px;text-align:right"
                                                                        onfocus="javascript:this.select();"
                                                                        onblur="on_blur(this.value,this.id)"
                                                                        onkeydown="kuanghao(this.value,this.id)"
                                                                        onkeyup="on_keypress('ylt_rlets1');"></font>
    </td>
    
</tr><tr>
    <th nowrap="nowrap" width="8%" background="<c:url value="/images/head.gif"/>"><font
            size="2">1#入炉二铁烧</font></th>
    <td nowrap="nowrap" width="8%" align="center"><font size="2"><input type="text" id="ylt_rlets1" name="ylt_rlets1"
                                                                        value="${yjrbph.ylt_rlets1}"
                                                                        onafterpaste="value=value.replace(/[^\d\.]/g,'')"
                                                                        style="width:80px;text-align:right"
                                                                        onfocus="javascript:this.select();"
                                                                        onblur="on_blur(this.value,this.id)"
                                                                        onkeydown="kuanghao(this.value,this.id)"
                                                                        onkeyup="on_keypress('ylt_rlzcq1');"></font>
    </td>
    
</tr><tr>
    <th nowrap="nowrap" width="8%" background="<c:url value="/images/head.gif"/>"><font
            size="2">1#入炉自产球</font></th>
    <td nowrap="nowrap" width="8%" align="center"><font size="2"><input type="text" id="ylt_rlzcq1" name="ylt_rlzcq1"
                                                                        value="${yjrbph.ylt_rlzcq1}"
                                                                        onafterpaste="value=value.replace(/[^\d\.]/g,'')"
                                                                        style="width:80px;text-align:right"
                                                                        onfocus="javascript:this.select();"
                                                                        onblur="on_blur(this.value,this.id)"
                                                                        onkeydown="kuanghao(this.value,this.id)"
                                                                        onkeyup="on_keypress('ylt_rlwgq1');"></font>
    </td>
    
</tr><tr>
    <th nowrap="nowrap" width="8%" background="<c:url value="/images/head.gif"/>"><font
            size="2">1#入炉进口矿</font></th>
    <td nowrap="nowrap" width="8%" align="center"><font size="2"><input type="text" id="ylt_rlwgq1" name="ylt_rlwgq1"
                                                                        value="${yjrbph.ylt_rlwgq1}"
                                                                        onafterpaste="value=value.replace(/[^\d\.]/g,'')"
                                                                        style="width:80px;text-align:right"
                                                                        onfocus="javascript:this.select();"
                                                                        onblur="on_blur(this.value,this.id)"
                                                                        onkeydown="kuanghao(this.value,this.id)"
                                                                        onkeyup="on_keypress('ylt_glpm1');"></font>
    </td>
    
</tr><tr>
    <th nowrap="nowrap" width="8%" background="<c:url value="/images/head.gif"/>"><font
            size="2">1#高炉喷煤量</font></th>
    <td nowrap="nowrap" width="8%" align="center"><font size="2"><input type="text" id="ylt_glpm1" name="ylt_glpm1"
                                                                        value="${yjrbph.ylt_glpm1}"
                                                                        onafterpaste="value=value.replace(/[^\d\.]/g,'')"
                                                                        style="width:80px;text-align:right"
                                                                        onfocus="javascript:this.select();"
                                                                        onblur="on_blur(this.value,this.id)"
                                                                        onkeyup="on_keypress('ylt_rljhyj2_sj');"></font>
    </td>
    
</tr><tr>
    <th nowrap="nowrap" width="8%" background="<c:url value="/images/head.gif"/>"><font
            color="red" size="2">1#炉铁合计</font></th>
    <td nowrap="nowrap" width="8%" align="center"><font size="2"><input type="text" id="ylt_thj1" name="ylt_thj1"
                                                                        value="${yjrbph.ylt_thj1}"
                                                                        onafterpaste="value=value.replace(/[^\d\.]/g,'')"
                                                                        style="width:80px;text-align:right"
                                                                        onfocus="javascript:this.select();"
                                                                        onblur="on_blur(this.value,this.id)"
                                                                        onkeyup="on_keypress('lt_zk');"></font>
    </td>    
</tr>
<tr>
    <th nowrap="nowrap" width="8%" background="<c:url value="/images/head.gif"/>"><font
            color="red" size="2">1#炉矿耗</font></th>
    <td nowrap="nowrap" width="8%" align="center"><font size="2"><input type="text" id="ylt_kh1" name="ylt_kh1"
                                                                        value="${yjrbph.ylt_kh1}"
                                                                                                                                                                                                                                                                                                                                                                            onafterpaste="value=value.replace(/[^\d\.]/g,'')"
                                                                        style="width:80px;text-align:right"
                                                                        onfocus="javascript:this.select();"
                                                                        onblur="on_blur(this.value,this.id)"
                                                                        onkeyup="on_keypress('lt_zk');"></font>
    </td>
    
</tr></table></from>
<script type="text/javascript">function kuanghao(value, id) {
        if (event.keyCode == 13) {
            var yltkh1 = new Array('ylt_rlsjk1', 'ylt_rlzcq1', 'ylt_rlwgq1', 'ylt_rlets1');
            for (var i = 0; i < ylt.lenght; i++) {
                if (yltkh1[i] == id) {
                    var ylt_rlsjk1 = $("#ylt_rlsjk1").val();
                    var ylt_rlzcq1 = $("#ylt_rlzcq1").val();
                    var ylt_rlwgq1 = $("#ylt_rlwgq1").val();
                    var ylt_rlets1 = $("#ylt_rlets1").val();
                    var ylt_thj1 = $("#ylt_thj1").val();                    var sum = (ylt_rlsjk1 + ylt_rlzcq1 + ylt_rlwgq1 + ylt_rlets1    ) / ylt_thj1 * 1000
                    alert(sum);
                    $("#ylt_kh1").val(sum);
                    alert($("#ylt_kh1").val(sum));                }
              }
           } 
         }
</script>我想实现页面文本框输入数字时,回车计算出矿耗.
但是现在页面输数回车没没有反映啊,后台也没有动作.