js方法收藏

1.验证非负数字

//onfocusout="checkQty(this);"

function checkQty(obj) {
    //排除0开头的非法输入
    if (obj.value.length >= 2) {
        var a = obj.value.charAt(0);
        var b = obj.value.charAt(1);
        if (a == '0' && b != '.') {
            obj.value = '0';
            alert('请输入正确的数字格式！');
            return;
        }
    }

    //数字验证
    var regExp = new RegExp(/^\d+(\.\d+)?$/);
    var result = regExp.test(obj.value);
    if (!result) {
        obj.value = '0';
        alert('请输入正确的数字格式！');
    }
}

 2.select动态绑定，选中

$.ajax({
    type: "POST",
    url: "../loadjsonM/PrinterTemplate_JhJson.ashx",
    async: false,
    data: { uptype: 3 },
    success: function (data) {
        if (data != '') {
            var printNames = data.toString().split(',');
            if (printNames != undefined && printNames.length > 0) {
                var searchtp = $("#printForm [name='printer']").get(0);
                searchtp.options.length = 0;
                for (var i = 0; i < printNames.length; i++) {
                    var nowarr = printNames[i];
                    searchtp.options.add(new Option(nowarr.toString(), nowarr.toString()));
                }
            }
        }
    }
});

$.post("../loadjsonM/printLog_JhJson.ashx", { uptype: 0 },
    function (data) {
        var back_json;
        eval(data);
        if (back_json.length == 1) {
            var printer = $("#printForm [name='printer']").get(0);
            var barcodeModel = $("#printForm [name='barcodeModel']").get(0);

            for (var i = 0; i < printer.options.length; i++) {
                if (printer.options[i].text == back_json[0].Printer) {
                    printer.options[i].selected = 'selected';
                }
            }

            for (var i = 0; i < barcodeModel.options.length; i++) {
                if (barcodeModel.options[i].text == back_json[0].BarcodeModel) {
                    barcodeModel.options[i].selected = 'selected';
                }
            }
        }
    }
);

3.扫描枪一般处理脚本

$("#searthtxt").keydown(function (event) {
     if (event.keyCode == 13) {
         $("#searchbtn").click();
         $("#searthtxt").select();
     }
 });

3.Js判断是否为空

var exp = null;
if (!exp && typeof(exp)!="undefined" && exp!=0)
{
    alert("is null");
}

 4.验证日期

<script language="javascript">
function check(){
var a = /^(\d{4})-(\d{2})-(\d{2})$/
if (!a.test(document.getElementById("TextBox1").value)) {
alert("日期格式不正确!")
return false
}
else
return true
}
</script> 

<script type="text/javascript">
    function check()
   {   alert("sss");
        var date = document.getElementById("TextBox1").value;
        var result = date.match(/((^((1[8-9]\d{2})|([2-9]\d{3}))(-)(10|12|0?[13578])(-)(3[01]|[12][0-9]|0?[1-9])$)|(^((1[8-9]\d{2})|([2-9]\d{3}))(-)(11|0?[469])(-)(30|[12][0-9]|0?[1-9])$)|(^((1[8-9]\d{2})|([2-9]\d{3}))(-)(0?2)(-)(2[0-8]|1[0-9]|0?[1-9])$)|(^([2468][048]00)(-)(0?2)(-)(29)$)|(^([3579][26]00)(-)(0?2)(-)(29)$)|(^([1][89][0][48])(-)(0?2)(-)(29)$)|(^([2-9][0-9][0][48])(-)(0?2)(-)(29)$)|(^([1][89][2468][048])(-)(0?2)(-)(29)$)|(^([2-9][0-9][2468][048])(-)(0?2)(-)(29)$)|(^([1][89][13579][26])(-)(0?2)(-)(29)$)|(^([2-9][0-9][13579][26])(-)(0?2)(-)(29)$))/);
        if(result==null)
        {
            alert("请输入正确的日期格式");
            return false;
        }

}
    </script>

function RQcheck(RQ) {
            var date = RQ;
            var result = date.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/);

            if (result == null)
                return false;
            var d = new Date(result[1], result[3] - 1, result[4]);
            return (d.getFullYear() == result[1] && (d.getMonth() + 1) == result[3] && d.getDate() == result[4]);

        }

function CheckAdd() {
            var ret = true;
            if (!RQcheck($id("txt_LLRQ").value)) {
                alert("请输入正确的日期");
                return false;
            }
            return ret;
        }

5.特殊日期转换

<script type="text/javascript">
        function Todate(num) { //Fri Oct 31 18:00:00 UTC+0800 2008
            num = num + "";
            var date = "";
            var month = new Array();
            month["Jan"] = 1; month["Feb"] = 2; month["Mar"] = 3; month["Apr"] = 4; month["May"] = 5; month["Jan"] = 6;
            month["Jul"] = 7; month["Aug"] = 8; month["Sep"] = 9; month["Oct"] = 10; month["Nov"] = 11; month["Dec"] = 12;
            var week = new Array();
            week["Mon"] = "一"; week["Tue"] = "二"; week["Wed"] = "三"; week["Thu"] = "四"; week["Fri"] = "五"; week["Sat"] = "六"; week["Sun"] = "日";
            str = num.split(" ");
            date = str[5] + "-";
            date = date + month[str[1]] + "-" + str[2];
            return date;
        }

        function test() {
            alert(Todate('Tue Mar 15 00:00:00 UTC+0800 2011'));
            //输出结果：2011-3-15
        }
    </script>