js常用函数的封装

1：//截取url带过来的参数

function getvl(name) {
    var reg = new RegExp("(^|\\?|&)" + name + "=([^&]*)(\\s|&|$)", "i");
    return reg.test(location.href) ? decodeURI(RegExp.$2.replace(/\+/g, " ")) : '';
};

2：//判断对象的长度

Object.size = function (obj) {
    var size = 0, key;
    for (key in obj) {
        if (obj.hasOwnProperty(key)) size++;
    }
    return size;
};
3：// 转换字符串成时间

function changeTime(t, nohour) {

    if (String(t).indexOf("-") >= 0 || t == null) {
        return t = '';
    } else {
        var date = new Date(t);
        Y = date.getFullYear() + '-';
        M = (date.getMonth() + 1 < 10 ? '0' + (date.getMonth() + 1) : date.getMonth() + 1) + '-';
        D = date.getDate() < 10 ? '0' + date.getDate() + ' ' : date.getDate() + ' ';
        h = date.getHours() < 10 ? '0' + date.getHours() + ':' : date.getHours() + ':';
        m = date.getMinutes() < 10 ? '0' + date.getMinutes() + ':' : date.getMinutes() + ':';
        s = date.getSeconds() < 10 ? '0' + date.getSeconds() : date.getSeconds();
        return nohour ? Y + M + D : Y + M + D + h + m + s;
    }
}

4://纯数字且不能输入空格且不能输入小数点
// isZero == zero可为零
// isZero == unNone不能为空格
function keepNum(obj, num, isZero) {
    var $this = $(obj);
    var v = $this.val();
    if (isNaN(v) || (v.indexOf('.') != -1)) {
        var values = v.slice(0, -1);
        if (isNaN(values)) {
            values = ''
        }
        values = values.replace(/\s/g, "");
        $this.val(values);
    } else {  //去除空格
        $this.val(v.replace(/\s/g, ""));
    }
    num && (function () {
        var newValue = $this.val();
        if (!isNaN(newValue) && newValue != '') {
            if (isZero == 'zero') {
                if (newValue < 0) {
                    newValue = 0;
                } else if (newValue > num) {
                    newValue = num;
                }
            } else {
                if (newValue < 1) {
                    newValue = 1;
                } else if (newValue > num) {
                    newValue = num;
                }
            }

        } else {
            if (isZero == 'unNone') {
                if (newValue < 1) {
                    newValue = 1;
                } else if (newValue > num) {
                    newValue = num;
                }
            }
        }
        $this.val(newValue);
    })()
}
5://纯数字且不能输入空格且不能输入小数点可以是负数   默认没有小数
function keepSR(obj, num,maxlength) {
    var imposeNum = maxlength ? (maxlength+1) : 1;
    var $this = $(obj);
    var v = $this.val();
    if (isNaN(v)) {
        if(v!='-'){
            var values = v.slice(0, -1);
            if (isNaN(values)) {
                values = ''
            }
            values = values.replace(/\s/g, "");
            $this.val(values);
        }   
    } else if (v.indexOf('.') != -1) {
        if (v.split('.')[1].length == imposeNum) {
            var values = v.slice(0, -1);
            $this.val(values);
        } else if (v.split('.')[1].length > imposeNum) {
            $this.val('');
        }
    }else {  //去除空格
        $this.val(v.replace(/\s/g, ""));
    }
    num && (function () {
        var newValue = $this.val();
        if (!isNaN(newValue) && newValue != '') {
            if (newValue < -num) {
                newValue = -num;
            } else if (newValue > num) {
                newValue = num;
            }
        }
        $this.val(newValue);
    })()
}
//数字且最限制小数点位数，（默认三位）且不能输入空格且可以为0
function keepSH(obj, num ,maxlength) {
    var $this = $(obj);
    var v = $this.val();
    var imposeNum = maxlength ? (maxlength+1) : 4;//限制小数点数量，默认为小数点后3位
    if (isNaN(v)) {
        var values = v.slice(0, -1);
        if (isNaN(values)) {
            values = ''
        }
        $this.val(values);
    } else if (v.indexOf('.') != -1) {
        if (v.split('.')[1].length == imposeNum) {
            var values = v.slice(0, -1);
            $this.val(values);
        } else if (v.split('.')[1].length > imposeNum) {
            $this.val('');
        }
    } else {
        $this.val(v.replace(/\s/g, ""));
    }

    var newValue = $this.val();
    if (!isNaN(newValue) && newValue != '') {
        if (newValue > num) {
            newValue = num;
        }
    }
    $this.val(newValue);
}

function keepSH2(obj, num ,maxlength) {
    var $this = $(obj);
    var v = $this.val();
    var imposeNum = maxlength ? (maxlength+1) : 4;//限制小数点数量，默认为小数点后3位
    if (isNaN(v)) {
        var values = v.slice(0, -1);
        if (isNaN(values)) {
            values = ''
        }
        $this.val(values);
    } else if (v.indexOf('.') != -1) {
        if (v.split('.')[1].length == imposeNum) {
            var values = v.slice(0, -1);
            $this.val(values);
        } else if (v.split('.')[1].length > imposeNum) {
            $this.val('');
        }
    } else {
        $this.val(v.replace(/\s|-/g, ""));
    }

    var newValue = $this.val();
    if (!isNaN(newValue) && newValue != '') {
        if (newValue > num) {
            newValue = num;
        }
    }
    $this.val(newValue);
}

// 检查是否为手机号
function checkMobile(text) {
    var myreg = /^(1+\d{10})$/;
    return !myreg.test(text) ? false : true;
}
//仅输入中文,字母,数字
function unCharacter(v) {
    return v.replace(/[^\a-\z\A-\Z0-9\u4E00-\u9FA5]/g,'')
}
//禁止特殊字符
function unSpecial(v) {
    return v.replace(/[^u4e00-u9fa5w]/g,'')
}

// 用来判断对象是否为空

function isEmptyObject(e) {
    var t;
    for (t in e)
        return !1;
    return !0
}

//格式化日期：yyyy-MM-dd     
function formatDate(date) {
   var myyear = date.getFullYear();
   var mymonth = date.getMonth() + 1;
   var myweekday = date.getDate();

   if (mymonth < 10) {
      mymonth = "0" + mymonth;
   }
   if (myweekday < 10) {
      myweekday = "0" + myweekday;
   }
   return (myyear + "-" + mymonth + "-" + myweekday);
}

//获得某月的天数     
function getMonthDays(myMonth) {
   var monthStartDate = new Date(nowYear, myMonth, 1);
   var monthEndDate = new Date(nowYear, myMonth + 1, 1);
   var days = (monthEndDate - monthStartDate) / (1000 * 60 * 60 * 24);
   return days;
}

//获得本季度的开始月份     
function getQuarterStartMonth() {
   var quarterStartMonth = 0;
   if (nowMonth < 3) {
      quarterStartMonth = 0;
   }
   if (2 < nowMonth && nowMonth < 6) {
      quarterStartMonth = 3;
   }
   if (5 < nowMonth && nowMonth < 9) {
      quarterStartMonth = 6;
   }
   if (nowMonth > 8) {
      quarterStartMonth = 9;
   }
   return quarterStartMonth;
}

//获得本周的开始日期     
function getWeekStartDate() {
   var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek);
   return formatDate(weekStartDate);
}

//获得本周的结束日期     
function getWeekEndDate() {
   var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek));
   return formatDate(weekEndDate);
}

//获得上周的开始日期     
function getpreWeekStartDate() {
   var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek - 7);
   return formatDate(weekStartDate);
}

//获得上周的结束日期     
function getpreWeekEndDate() {
   var weekEndDate = new Date(nowYear, nowMonth, nowDay + (-1 - nowDayOfWeek));
   return formatDate(weekEndDate);
}

//获得本月的开始日期     
function getMonthStartDate() {
   var monthStartDate = new Date(nowYear, nowMonth, 1);
   return formatDate(monthStartDate);
}

//获得本月的结束日期     
function getMonthEndDate() {
   var monthEndDate = new Date(nowYear, nowMonth, getMonthDays(nowMonth));
   return formatDate(monthEndDate);
}

//获得上月开始时间  
function getLastMonthStartDate() {
   var lastMonth2 = lastMonth;
   var nowYear2 = nowYear;
   if (nowMonth < lastMonth) {
      var lastMonth2 = 11;
      var nowYear2 = nowYear - 1;
   }
   var lastMonthStartDate = new Date(nowYear2, lastMonth2, 1);
   return formatDate(lastMonthStartDate);
}

//获得上月结束时间  
function getLastMonthEndDate() {
   var lastMonth2 = lastMonth;
   var nowYear2 = nowYear;
   if (nowMonth < lastMonth) {
      var lastMonth2 = 11;
      var nowYear2 = nowYear - 1;
   }
   var lastMonthEndDate = new Date(nowYear2, lastMonth2, getMonthDays(lastMonth));
   return formatDate(lastMonthEndDate);
}

//获得本季度的开始日期     
function getQuarterStartDate() {

   var quarterStartDate = new Date(nowYear, getQuarterStartMonth(), 1);
   return formatDate(quarterStartDate);
}

//获得本季度的结束日期     
function getQuarterEndDate() {
   var quarterEndMonth = getQuarterStartMonth() + 2;
   var quarterStartDate = new Date(nowYear, quarterEndMonth, getMonthDays(quarterEndMonth));
   return formatDate(quarterStartDate);
}

//计算当天 昨天 前天
function _getDay(day) {
   var today = new Date();

   var targetday_milliseconds = today.getTime() + 1000 * 60 * 60 * 24 * day;

   today.setTime(targetday_milliseconds); //注意，这行是关键代码    

   var tYear = today.getFullYear();
   var tMonth = today.getMonth();
   var tDate = today.getDate();
   tMonth = doHandleMonth(tMonth + 1);
   tDate = doHandleMonth(tDate);
   return tYear + "-" + tMonth + "-" + tDate;
}

function doHandleMonth(month) {
   var m = month;
   if (month.toString().length == 1) {
      m = "0" + month;
   }
   return m;
}

/*获取选中的文字*/

var _getSelectedText = function() {

if (window.getSelection) {

return window.getSelection().toString();

} else if (document.getSelection) {

return document.getSelection();

} else if (document.selection) {

return document.selection.createRange().text;

}else{

return "";

}

}