Encapsulation of commonly used functions in js

1: //Intercept the parameters brought by the url

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://Pure numbers and no spaces and no decimal points 
// isZero == zero can be zero 
// isZero == unNone cannot be spaces 
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 { //remove spaces 
        $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://Pure numbers and no spaces and no decimal point can be negative default no decimal 
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 { //Remove spaces 
        $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); 
    })() 
} 
//Number and the most limited number of decimal places, (default three digits) and can not enter spaces and can be 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);
}

// Check if it is a mobile phone number 
function checkMobile(text) { 
    var myreg = /^(1+\d{10})$/; 
    return !myreg.test(text) ? false : true; 
} 
//Only enter Chinese, Letters, numbers 
function unCharacter(v) { 
    return v.replace(/[^\a-\z\A-\Z0-9\u4E00-\u9FA5]/g,'') 
} 
//Prohibit special characters 
function unSpecial( v) { 
    return v.replace(/[^u4e00-u9fa5w]/g,'') 
}

// used to check if the object is empty

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;//Get the start month of the quarter     
}


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); 
} 

//Get the start date of last week      
function getpreWeekStartDate() { 
   var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek - 7); 
   return formatDate(weekStartDate); 
} 

//Get the end date of last week      
function getpreWeekEndDate() { 
   var weekEndDate = new Date(nowYear, nowMonth, nowDay + (-1 - nowDayOfWeek)); 
   return formatDate(weekEndDate ); 
} 

//Get the start date of this month      
function getMonthStartDate() { 
   var monthStartDate = new Date(nowYear, nowMonth, 1); 
   return formatDate(monthStartDate); 
} 

//Get the end date of this month     
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); 
} 

//Get the start date of the quarter      
function getQuarterStartDate() { 

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

//Get the end date of the quarter      
function getQuarterEndDate() { 
   var quarterEndMonth = getQuarterStartMonth() + 2; 
   var quarterStartDate = new Date(nowYear , quarterEndMonth, getMonthDays(quarterEndMonth)); 
   return formatDate(quarterStartDate); 
} 

//Calculate the day before yesterday 
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;
}