//限制文本框的输入长度

$(function () {

    $(document).on("keypress", ".txt-valid-len", function (e) {

        if (e.keyCode == 8) {

            return true;

        }

        else {

            var len = $(this).data("maxlength") || 0;

            if (len > 0) {

                return (this.value.length <= len);

            }

        }

        return true;

    });

    //粘贴

    $(document).on("paste", ".txt-valid-len", function () {

        var len = $(this).data("maxlength") || 0;

        if (len > 0) {

            return ((this.value.length + event.clipboardData.getData('Text').length) <= len);

        }

        return true;

    });

    $(document).on("keyup input", ".txt-valid-len", function (e) {

        var keyCode = e.keyCode || e.which || e.charCode;

        if (keyCode == 46 || keyCode == 8) {

        }

        else {

            var len = $(this).data("maxlength") || 0;

            if (len > 0) {

                if (this.value.length > len) {

                    this.value = com.cutStr(this.value, len, "");

                }

            }

        }

    });

});