if条件基于jquery中for循环中的字符串答案

【问题标题】：if condition based on a string in for loop in jqueryif条件基于jquery中for循环中的字符串
【发布时间】：2015-03-22 07:41:07
【问题描述】：

我将在代码中解释我的问题。请看下面的代码

var monthNames = ["JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC"];
var ctdate = (new Date()).getMonth() + 1;// getting current month
var str=new Date().getFullYear()+'';
str= str.match(/\d{2}$/);//current year is 15(as this year is 2015)
var strprev= str-1;//previous year is 14
var dynmonths = new Array();
dynmonths = monthNames.slice(ctdate).concat(monthNames.slice(0, ctdate));

//here the output comes for last 12 months starting from currentmonth-12 (i.e APR in this case) to current month (i.e MAR)
//dynmonths = ["APR","MAY","JUN","JUL","AUG","SEP","AUG","SEP","OCT","NOV","DEC","JAN","FEB","MAR"];

//I am rotating dynmonths in a for loop to get full dates i.e between (01-APR-14 to 01-MAR-15)

for (var i = 0, length = dynmonths.length; i < length; i++) {
var month = '01-' + dynmonths[i] + '-' + strcurrent;
}

但问题是month 一直在使用14。这是错误的。在 01-DEC-14 之后的下个月必须是 01-JAN-15、01-FEB-15 等等。如何在 for 循环中检查 DEC 并在 DEC 年后必须更改为 year+1

提前致谢

【问题讨论】：

标签： javascript jquery arrays if-statement for-loop

【解决方案1】：

使用下面的代码就可以了。

function ddd()
{
var monthNames = ["JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC"];
var ctdate = (new Date()).getMonth() + 1;// getting current month
var str=new Date().getFullYear()+'';
str= str.match(/\d{2}$/);//current year is 15(as this year is 2015)
var strprev= str-1;//previous year is 14
var dynmonths = new Array();
dynmonths = monthNames.slice(ctdate).concat(monthNames.slice(0, ctdate));

//here the output comes for last 12 months starting from currentmonth-12 (i.e APR in this case) to current month (i.e MAR)
//dynmonths = ["APR","MAY","JUN","JUL","AUG","SEP","AUG","SEP","OCT","NOV","DEC","JAN","FEB","MAR"];

//I am rotating dynmonths in a for loop to get full dates i.e between (01-APR-14 to 01-MAR-15)

for (var i = 0, length = dynmonths.length; i < length; i++) {

if(dynmonths[i]=='JAN')
{
var str = parseInt(str)+parseInt(1);
}
var month = '01-' + dynmonths[i] + '-' + str;
    document.writeln(month);
	document.write("<br />");
   
}
}

&lt;body onload="ddd()"&gt;

【讨论】：

【解决方案2】：

您可以声明变量 bool = false 并检查您是否在 DEC 将其更改为 true（或使用超过一年的计数器）：

 var monthNames = ["JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC"];
var ctdate = (new Date()).getMonth() + 1;// getting current month
var str=new Date().getFullYear()+'';
str= str.match(/\d{2}$/);//current year is 15(as this year is 2015)
var strprev= str-1;//previous year is 14
var dynmonths = new Array();
dynmonths = monthNames.slice(ctdate).concat(monthNames.slice(0, ctdate));

//here the output comes for last 12 months starting from currentmonth-12 (i.e APR in this case) to current month (i.e MAR)
//dynmonths = ["APR","MAY","JUN","JUL","AUG","SEP","AUG","SEP","OCT","NOV","DEC","JAN","FEB","MAR"];

//I am rotating dynmonths in a for loop to get full dates i.e between (01-APR-14 to 01-MAR-15)

var isPassYear = false;

for (var i = 0, length = dynmonths.length; i < length; i++) {
    var month;
    if (isPassYear)
        //do something
    else
        month  = '01-' + dynmonths[i] + '-' + strcurrent;

    if (monthNames[11] == dynmonths[i]) {
        isPassYear = true;
    }
}

第二个选项是使用 Date 对象并每次将他的月份追加一个，如果您将 append 设置为第 12 个月，它会自动转到下一年。

【讨论】：