变量在“ for循环”中重置

Question

我将信息从数据库推送到日历，其中每个日期的ID都等于数据库中的ID。 代码遍历数据库以搜索匹配对。 如果找到匹配项，则将图像名称放入日历中的图像标签中。 但是，默认图像是唯一显示的图像，并且变量calImg似乎已重置为默认图像。 var idCalendar = []; var arrayCalendar = -1; var calImg; 是全局变量

 while (counter <= numOfDays) { var dateID = counter + monthIDName; idCalendar[counter - 1] = dateID; //alert(idCalendar[counter-1]); // When to start new line. if (weekdays2 > 6) { weekdays2 = 0; htmlContent += "</tr><tr>"; } //check to ensure the mydb object has been created ///////////////////////////////////////////////////////////////////////////// if (mydb) { //Get all the entry from the database with a select statement mydb.transaction(function(t) { t.executeSql("SELECT rating FROM entry WHERE calendar=?", [idCalendar[arrayCalendar + 1]], function(t, results) { var i; //Iterate through the results if (results.rows.length != 0) { for (i = 0; i < results.rows.length; i++) { var row = results.rows.item(i); calImg = row.rating; alert(idCalendar[arrayCalendar] + calImg); } } else { alert(idCalendar[arrayCalendar]); calImg = 'default'; } }); arrayCalendar++; }); } else { myApp.alert("query error"); } //////////////////////////////////////////////////////////////////////////////////////////////////// // if counter is current day. // highlight current day using the CSS defined in header. if (counter == day && month == curMonth && year == curYear) { htmlContent += "<td class='dayNow' id='" + counter + monthIDName + "' onMouseOver='this.style.background=\\"#FF0000\\"; this.style.color=\\"#FFFFFF\\"' " + "onMouseOut='this.style.background=\\"#FFFFFF\\"; this.style.color=\\"#FF0000\\"'>" + counter + "<img src= 'img/" + calImg + ".png' align='left' height= '15' width= '15'>" + "<br>" + "</td>"; } else { htmlContent += "<td class='monthNow' id='" + counter + monthIDName + "' onMouseOver='this.style.background=\\"#FF0000\\"'" + " onMouseOut='this.style.background=\\"#FFFFFF\\"'>" + counter + "<img src= 'img/" + calImg + ".png' align='left' height= '15' width= '15'>" + "<br>" + "</td>"; } weekdays2++; counter++; }