操作 select的options对象

HTML DOM集合
最近我朋友要我帮他写一些需求,然后就需要更新select中的options对象
我还以为要使用InnerHTML循环出来
结果最后出奇的顺利,因为发现了这一个属性
然后我最近打酱油的看来一本书
编写高质量Javascript代码,我还是有一些印象的就把它当中的建议3:减少全部变量污染加了进去
然后实现的时候,又发现了不止哪个小哥哥小姐姐写的很好用的封装好了利用了HTML DOM实现的操作select中的options集合的方法
参考地址:
javascript操作Select中的 options集合_日积月累@海纳百川的博客-CSDN博客
object.options.add(new Option(label,value))方法向集合里添加一项option对象;
 
        object.options.remove(index) 方法移除options集合中的指定项;
         object.options(index)或options.item(index)可以通过索引获取options集合的指定项;
         select标记还有一个属性为selectedIndex,通过它可能获取当前选择的option索引:object.selectedIndex
          1.清空options集合
             function   optionsClear(object)  
             {   var length = object.options.length;
                  for(var i=length-1;i>=0;i--){
                      e.options.remove(i);
                 }
             } 
         2.添加一项新option
            function addOption(object)
            {  object.add(new Option(label,value));
               //使用options集合中最后一项获取焦点
                object.selectedIndex = object.lentht-1;
             }
        3.删除options集合中指定的一项option
           function removeOption(index)
           { if(index >= 0)
               { object.remove(index);
(中间有问题需要自己优化一下~)
最后贴一下最后实现了的代码
html:
< tr >
                                           < td >选择部门 td >
                                           < td >
                                                < select id = 'data' class = 'data' name = 'player2' lay-search lay-verify = 'required' style = ' padding-right : 30 px ;
    cursor: pointer ;
      display:inline ;
      height: 38 px ;
    line-height: 1.3;
    line-height : 38px\9 ;
    border-width : 1 px ;
    border-style : solid ;
    background-color : #fff ;
    border-radius : 2 px ;
      ' onchange = ' selectMonth ( this ) ' >
                                                     < option value = '70' >公司领导 option >
                                                     < option value = '71' >顾问部 option >
                                                     < option value = '72' >办公室 option >
                                                     < option value = '73' >人力资源部 option >
                                                     < option value = '74' >董秘室 option >
                                                     < option value = '75' >财务部 option >
                                                      select >
                                            td >
                                      tr >
                                     < tr >
                                           < td >选择明细栏目 td >
                                           < td >
                                                < select name = 'player2' id = "selectPlayer2" lay-search lay-verify = 'required' style = ' padding-right : 30 px ;
    cursor: pointer ;
      display:inline ;
      height: 38 px ;
    line-height: 1.3;
    line-height: 38 px \9;
    border-width: 1 px ;
    border-style: solid ;
    background-color: # fff ;
    border-radius: 2px;
     ' >
                                                     < option value = '54' >办公室用品 option >
                                                     < option value = '55' >日用品 option >
                                                     < option value = '56' >名片 option >
                                                     < option value = '57' >客户部工装 option >
                                                     < option value = '58' >公司接待 option >
                                                     < option value = '59' >食堂 option >
                                                     < option value = '60' >酒水 option >
                                                      select >
                                            td >
                                      tr >
js:
var data = [{ "title" : '办公室用品' , "id" : "54" }, { "title" : '日用品' , "id" : "55" }];
                 var wupin = {};
                wupin.ids = [];
                wupin.titles = [];
                 for ( var i in data) {
                      //表示遍历数组,而i表示的是数组的下标值,
                      //data[i]表示获得第i个json对象即JSONObject
                      //data[i]通过.字段名称即可获得指定字段的值
                      wupin.ids[i] = data[i].id;
                     wupin.titles[i] = data[i].title;
                      console .log(data[i].title);
                }
                 console .log(wupin.ids);
                 console .log(wupin.titles);
                 function selectMonth ( e ) {
                      console .log(e.value);
                      var selectPlayer2 = document .getElementById( "selectPlayer2" );
                     optionsClear(selectPlayer2);
                      for ( var i in wupin.ids){
                           addOption(selectPlayer2, wupin.titles[i], wupin.ids[i]);
                     }
                      //addOption(selectPlayer2, wupin.titles, wupin.ids);
                 }
                 function optionsClear ( object ) {
                      var length = object .options.length;
                      for ( var i = length - 1 ; i >= 0 ; i -- ) {
                            object .options.remove(i);
                     }
                }
                 function addOption ( object , label , value ) {
                      object .add( new Option(label, value));
                      //使用options集合中最后一项获取焦点
                      object .selectedIndex = object .lentht - 1 ;
                }
~~好像排版又很乱,就这样吧~~
很久了的,没有印象在草稿箱,一起发了==

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