html,javaScript中怎么控制复选框checkbox的全选,全不选,以及全选中,全选按钮选中,其中一个或者多个没选,则全选按钮不被选中

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<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%@ include file="/commons/jsp/htmtag.jsp"%> <html><head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title></title><script> //当全选按钮,选中时,所有复选框被选中,当全选按钮不被选中时,所有的也不被选中function funSelAll(){var selects=document.getElementsByName("selOne");if(document.getElementsByName("selAll")[0].checked==true){for(var i=0;i<selects.length;i++){selects[i].checked=true;}}else{for(var i=0;i<selects.length;i++){selects[i].checked=false;}}}//当所有的复选框被选中时,全选按钮被选中,当其中任意一个或者多个没被选中时,全选按钮不被选中function funSelOne(){var one=document.getElementsByName("selOne");var all=document.getElementsByName("selAll")[0]var selCount=0;var unSelCount=0;for(var i=0;i<one.length;i++){ if(one[i].checked==true){  selCount++; } if(one[i].checked==false){  unSelCount++; } if(selCount==one.length){  all.checked=true; } if(unSelCount>0){  all.checked=false; }}} function funDelBatch(){var strsValue="";var strs=document.getElementsByName("selOne");if(strs!=null&&strs.length>0){for(var i=0;i<strs.length;i++){//----if(strs[i].checked==true){strsValue=strsValue+strs[i].value+",";}//--- }}document.form1.action="<%=request.getContextPath()%>/grade/allGrades.htm?method=toDetailGradeBatch&gradeIds="+strsValue;document.form1.submit();}</script></head><body><!--toDetailGradeByName--><form action="<%=request.getContextPath()%>/grade/allGrades.htm?method=toDetailGradeByName" method="post" id="form1" name="form1"><div align="center"><input type="text" name="gradeName" value="${gradeName}"><input type="submit" value="查询"><input type="reset" value="重置"><br/> <br/><input type="button" value="添加" onClick="window.open('http://localhost:8080/demo/jsp/grade/gradeAdd.jsp');"><input type="button" value="批量删除" onClick="funDelBatch()"></div><table border="1px"  align="center" border="1" cellpadding="2" cellspacing="0" bordercolorlight="#000000" bordercolordark="#FFFFFF" bgcolor="#FFFFEE"><c:if test="${not empty '${volists}'}"><tr><td><input type="checkbox" name="selAll" onClick="funSelAll(this)"></td><td>班级编码</td><td>班级名称</td><td>操作</td></tr><c:forEach items="${volists}" var="vo"><tr><td><input type="checkbox" name="selOne" value="${vo.gradeId}" onClick="funSelOne(this)"></td><td>${vo.gradeId}</td><td>${vo.gradeName}</td><td><a href="<%=request.getContextPath()%>/grade/allGrades.htm?method=toDeleteGrade&gradeId=${vo.gradeId}">删除</a><a href="<%=request.getContextPath()%>/grade/allGrades.htm?method=toDetailGrade&gradeId=${vo.gradeId}">修改</a></td></tr></c:forEach></c:if></table></form> </body></html>

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