JS checkbox 批量选择

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// 判断是否选中 function anyChecked(){            var elements=document.form1.elements; // form1为表单name的值        var counter=elements.length;        for(var i=0;i<counter;i++){            var element=elements[i];            alert();            if(element.checked == true){            alert(element.value);             return true;            }        }        return false;    }

//全选function selectAll(){      var checklist = document.getElementsByName ("controlAll");     if(document.getElementById("selectAll").checked)     {     for(var i=0;i<checklist.length;i++)     {        checklist[i].checked = 1;        if(i == checklist.length-1){        id = id + checklist[i].value;     }else{        id = id + checklist[i].value + ',';     }             }         }else{    for(var j=0;j<checklist.length;j++)    {       checklist[j].checked = 0;    }    id = "";    }  }

//多选 var checklist = document.getElementsByName ("controlAll");for(var i=0;i<checklist.length;i++){     if(checklist[i].checked == true && i == checklist.length-1){       id = id + checklist[i].value; }else if(checklist[i].checked == true){       id = id + checklist[i].value + ',';   }   }

// html 代码 <tr class="biaoge_h">          <th><input type="checkbox" onclick="selectAll()"  name="selectAll" id="selectAll" value=""></input></th><th>省份</th><th>市份</th><th>操作</th>      </tr><tr>     <td><input type="checkbox" id="controlAll" name="controlAll" value="<%=provinceId %><%=cityId %>"></input></td>       <td align="center"><%=provinceName %></td>       <td align="center"><%=cityName%></td>       <td align="center"><%= oper %>         </td>    </tr>

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