tips

1.获取诸如2014-05-10的时间

           function get_time(n_day_ago)
            {
                var cur_date=new Date();
                var dst_date=new Date(cur_date - n_day_ago*86400000);
                var dst_year=dst_date.getFullYear();
                var dst_month=dst_date.getMonth()+1;
                var dst_day=dst_date.getDate();
                var dst_formate_date=dst_year + "-" + (dst_month < 10 ? "0" + dst_month : dst_month) + "-" 
                    + (dst_day < 10 ? "0" + dst_day:dst_day );
                return   dst_formate_date;
            };

2.highchart api 访问设置

var highchart_option={
                    chart: {
                        renderTo: 'upload_quantity', //DIV容器ID
                        type: 'line',
                        zoomType: 'x'
                    },
                    title: {
                        text: ' 图片上传',
                        x: -20 //center
                    },
                    subtitle: {
                        text: ' 图片运维组',
                        x: -20,
                    },
                    xAxis: {
                        labels: {
                            rotation:90,
                        },
                        lineWidth:1

                    },
                    yAxis: {
                        title: {
                            text: '数量(张)'
                        },
                        plotLines: [{
                            value: 0,
                            width: 1,
                            color: '#808080'
                        }]
                    },
                    tooltip: {
                        valueSuffix: '张',
                        crosshairs: true,
                        shared: true
                    },
                    legend: {
                        layout: 'vertical',
                        align: 'right',
                        verticalAlign: 'middle',
                        borderWidth: 0
                    },
                    tickInterval:1,
                    series: [{
                    }]                  
                }

访问方式：

                            highchart_option.xAxis.categories=json_date;
                            highchart_option.series=json_data;
                            highchart_option.xAxis.labels["step"]=Math.round(json_date.length / 20);
                            new Highcharts.Chart(highchart_option);

3.php 实现小数保留若干位

$a=10.121212;

$b=round($a,2);

4.php实现打印出某个区间段的时间

        ini_set('date.timezone','Asia/Shanghai');
        $date_i=$date_from;
        $date_range=array();
        while($date_i<=$date_to)
        {   
            $date_range[]=$date_i;
            $date_i=date("Y-m-d",strtotime($date_i." +1 days "));
        }   

5.jquery 遍历数组

<script type="text/javascript">
$(function ()
	{ 
                var div_array=['quantity','avg_capacity','avg_time','avg_rate'];
                $.each(div_array,function(key,val){
					console.log(key+val);
                });
	});
</script>

6.一个sql语句查询

SQL查询语句如下：
select * from table where (ID = 10) or (ID = 32) or (ID = 22) or (ID = 76) or (ID = 13) or (ID = 44)
让结果按10，32，22，76，13，44的顺序检索出来,请问如何书写？
select * from table
where id in (10,32,22,76,13,44)          
order by field(id,10,32,22,76,13,44) desc

7.监听checkbox事件 jquery控制

    $("input[type='checkbox']").bind("click", function(data) 
    {   
        var id=$(this).attr('id');
        console.log(id);
        if(id=="upload_map")
        {   
            if(data.target.checked==true)
                $("#map_div_upload_all").show();
            else
                $("#map_div_upload_all").hide();
        }   
        if(id=="download_map")
        {   
            if(data.target.checked==true)
                $("#map_div_download_all").show();
            else
                $("#map_div_download_all").hide();
        }   
    }); 

8.遍历json数组

            $.each(data,function(key,val)
            {
                var append_str="<option></option>";
                $.each(data[key],function(option_key,option_val){
                    append_str+="<option>"+option_val+"</option>";
                });
                $("#"+"curve_"+key).empty();
                $("#"+"curve_"+key).append(append_str);
            });

9.按键事件

    $("#submit_curvebtn").click(function()
    {
        $.ajax({
            url:"/imgbed_statistics/curve/control/get_ispcurve_info.php",
            type:"POST",
            data:$('#curve_form').serialize(),
            async:false,
            dataType:'json',
            success:function(data)
            {
                curve_option.series=data["data"];
                curve_option.xAxis.categories=data["date"];
                console.log(data["date"].length);
                curve_option.xAxis.labels["step"]=Math.round(data["date"].length / 20);
                if(data["date"].length>10)
                    curve_option.xAxis.labels["rotation"]=90
                new Highcharts.Chart(curve_option);
            },
            error:function()
            {
                alert("error");
            }
        });
    });

10.清空一个id下属的子html

$("#map_download_td").empty();

11.bootstrap的分页功能

   var download_target=$('#map_download_pagination');
    var download_page_option={
        prev: '<',
        next: '>',
        left: 3,
        right: 1,
        page: 13,
        lastPage: 3,
        click: function(i) {
            download_page_option.page = i;
            download_target.pagination(download_page_option);
            $("#map_download_td").empty();
            for(var k=0;k<12&&12*(i-1)+k<download_table.length;k++)
            {
                    city_name=download_table[12*(i-1)+k]["name"];
                    city_count=download_table[12*(i-1)+k]["count"];
                    str="<tr><td>"+city_name+"</td><td>"+city_count+"</td></tr>";
                    $("#map_download_td").append(str);
            }
        }
    };
    download_target.pagination(download_page_option);

12. php报错 Warning: Cannot modify header information - headers already sent by (output started at 。。。。。。。。。。。。。。。。。

解决方式：output_buffering = 4096或者output_buffering = on