第一次写大量的写js 留个纪念

     function CateCode(cate){
                this.cate = cate;
                this.sub_cate =  function(level){
                    var arr = [];
                    for(var i=0;i<this.cate.length;i++){
                        if(this.cate[i]['parent'] == level){
                            arr.push({code:this.cate[i]['code'],name:this.cate[i]['name'],parent:this.cate[i]['parent']})
                        }
                    }
                    return arr;
                }
                this.getParent =  function (catecode){
                    var nav = [];
                    nav.push({code:"0"});
                    var code_len = catecode.length;
                    for (var i = 1; i < 4; i++) {
                        //测试这个位置是否为00
                        var catecode_level_test = catecode.substring((i - 1) * 2, 2);
                        if (catecode_level_test == '00') {
                            break;
                        }
                        var catecode_level = catecode.substring( 0, i * 2)+this._strrepeat('0', code_len - i * 2);
                        nav.push({code:catecode_level});
                    }
                    return nav;
                }
                this._strrepeat =  function (str,count){
                    var goodstr = "";
                    for(var i=0;i<count;i++){
                        goodstr+=str.toString();
                    }
                    return goodstr;
                }


            }
            function CateSelect(cate){
                var _id=new Date().getTime() % 10000;
                var _this=this;
                this.id=_id;
                this.catecode='';
                this.set=function(val){
                    this.catecode=val;
                }
                this.div_obj=null;
                this.call_back=function(){}
                this.setCallback=function(fun){
                    this.call_back=fun;
                }

                this.change=function(){
                    var level=parseInt($(this).attr('level'));

                    for(var i =level+1;i<4;i++){
                        var   sel='#cate_'+(i)+'_'+_this.id;
                        $(sel).css('display','none');
                    }
                    if(level<4){
                        var arr=cate_obj.sub_cate($(this).val());
                        var sel='#cate_'+(level+1)+'_'+_this.id;
                        if(level>0){
                            $(sel).html('');
                        }
                        $(arr).each(function(i,row){
                            $(sel).append($('<option value="'+row['code']+'">'+row['name']+'</option>'));
                        })
                        if(arr.length){
                            var   sel='#cate_'+(level+1)+'_'+_this.id;
                            $(sel).css('display','');
                        }else{
                            $(sel).css('display','none');
                            _this.call_back($(this).val())
                        }
                    }
                }
                this.show=function(div_obj){
                    this.div_obj=div_obj;

                    if(! $('#cate_0_'+this.id).length ){
                        var html=[];
                        for(var i=0;i<4;i++){
                            html.push('<select level="'+i+'" id="cate_'+i+'_'+this.id+'" style="display:none"></select>');
                        }
                        $(div_obj).html(html.join("\n"));
                        $('#cate_0_'+this.id).change(_this.change)
                        $('#cate_1_'+this.id).change(_this.change)
                        $('#cate_2_'+this.id).change(_this.change)
                        $('#cate_3_'+this.id).change(_this.change)
                    }

                    var arr=cate_obj.sub_cate('0');
                    $(arr).each(function(i,row){
                        $('#cate_0_'+_id).append($('<option value="'+row['code']+'">'+row['name']+'</option>'));
                    })
                    $('#cate_0_'+_id).css('display','');
                    if(this.catecode!="0"){
                        var arr = cate_obj.getParent(this.catecode);
                        arr=arr.slice(1);
                        if(arr.length){
                            $(arr).each(function(i,row){
                                $('#cate_'+i+'_'+_id).val(row['code']);
                                $('#cate_'+i+'_'+_id).trigger('change');                                
                            });
                        }
                    }
                }
            }

     cate_obj = new CateCode(cate);
            show_obj = new CateSelect(cate);




            show_obj.set($("#hiddcate").val());
            show_obj.setCallback(function(val){
                alert('select :'+val);
            })
            show_obj.show($('#div_show_select')[0]);