几段代码

一、给下拉框增加选项（$(this).val()为一check  ,this.nextSibling.nodeValue为check右边的标签）

首先是判断是否存在

       var ist = true;

var aaa = "<option value='" + $(this).val() + "'>" + this.nextSibling.nodeValue + "</option>";
                                    $("#rightSel option").each(function () {
                                        // alert($(this).text());
                                        if ($(this).text() == st) {
                                            ist = false;
                                        }
                                    })
                                    //  if (      $("#rightSel option[value="+ss+"]").length<=0) $("#rightSel").append(aaa);
                                    if (ist) $("#rightSel").append(aaa);