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我正在爲大學圖書館開發一個新網站。它將包含顯示任何特定日期的營業時間的功能。許多庫使用PHP和後端數據庫或Google日曆集成的組合來完成此操作。由於各種原因，我們不能這樣做，所以我選擇使用Javascript，因爲它已知與我們的CMS（WordPress）合作，而無需打擾校園網站管理員。使用Javascript顯示營業時間
我最初的做法是使用幾個不同的文件，每個文件都帶有一個switch語句，用於顯示基於星期幾的小時數。我們有3種小時（正常，考試周和調解），只有一個地點。儘管如此，必須交換文件會引起一定程度的人爲錯誤。
因此我決定使用一個文件。最有意義的方法是獲取日期，格式化爲月/月（第一秒，第三等）/日期的數目，並使用一系列if ... else語句將當前日期與然後運行switch語句爲當前星期幾選擇正確的小時數。
問題是條件在第一個if語句不斷評估爲真，即使它不是。任何人都可以告訴我我做錯了什麼嗎？還是有更好的方法來完成這項任務？
這裏是我的代碼：
http://jsfiddle.net/mjcodelib/9aKmC/
var current = new Date(); //creates new date object
var date = current.getDate(); //gets date of month
var weekDay = current.getDay(); //gets day of week
var week_num = Math.floor((date - 1)/7) + 1; //determines the week in the month
var month = current.getMonth() + 1; //gets month number
var date_formatted = month + '/' + week_num + '/' + weekDay;
//puts date into month/week number/date format
var date_month = month + '/' + date;
var date_test = new Date (2014, 11, 24); //for troubleshooting
if (date_formatted >= '12/3/1') { //begin winter intercession
switch (weekDay) {
case 0:
document.getElementById("hours").innerHTML="Closed Today";
break;
case 1:
case 2:
case 3:
case 4:
document.getElementById("hours").innerHTML="Today's Hours: 8:00AM to 4:30PM" + date_test;
break;
case 5:
document.getElementById("hours").innerHTML="Today's Hours: 8:00AM to 4:00PM";
break;
case 6:
document.getElementById("hours").innerHTML="Closed Today";
break;
}
} else if (date_formatted >= '12/2/1') { //begin fall exam week
switch (weekDay) {
case 0:
document.getElementById("hours").innerHTML="Today's Hours: 2:00PM to 12:00PM";
break;
case 1:
case 2:
case 3:
case 4:
document.getElementById("hours").innerHTML="Today's Hours: 7:30AM to 12:00AM";
break;
case 5:
document.getElementById("hours").innerHTML="Today's Hours: 7:30AM to 4:00PM";
break;
case 6:
document.getElementById("hours").innerHTML="Closed Today";
break;
}
} else if (date_formatted >= '11/4/1') { //begin Thanksgiving intercession
switch (weekDay) {
case 0:
document.getElementById("hours").innerHTML="Closed Today";
break;
case 1:
case 2:
case 3:
case 4:
document.getElementById("hours").innerHTML="Today's Hours: 8:00AM to 4:30PM";
break;
case 5:
document.getElementById("hours").innerHTML="Today's Hours: 8:00AM to 4:00PM";
break;
case 6:
document.getElementById("hours").innerHTML="Closed Today";
break;
}
} else if (date_formatted >= '10/4/1') { //resume regular hours after fall break
switch (weekDay) {
case 0:
document.getElementByID("hours").innerHTML="Today's Hours: 2:00PM to 10:00PM";
break;
case 1:
case 2:
case 3:
case 4:
document.getElementById("hours").innerHTML="Today's Hours: 7:30AM to 10:00PM";
break;
case 5:
document.getElementById("hours").innerHTML="Today's Hours: 7:30AM to 4:00PM";
break;
case 6:
document.getElementById("hours").innerHTML="Closed Today";
break;
}
} else if (date_formatted > '10/3/3') { //Fall break
switch (weekDay) {
case 0:
document.getElementById("hours").innerHTML="Closed Today";
break;
case 1:
case 2:
case 3:
case 4:
document.getElementById("hours").innerHTML="Today's Hours: 8:00AM to 4:30PM";
break;
case 5:
document.getElementById("hours").innerHTML="Today's Hours: 8:00AM to 4:00PM";
break;
case 6:
document.getElementById("hours").innerHTML="Closed Today";
break;
}
} else if (date_formatted == '10/3/3') { //begin fall break
document.getElementByID("hours").innerHTML="Today's Hours: 7:30 AM - 5:00PM";
} else if (date_formatted >= '8/3/1') { //begin fall semester
switch (weekDay) {
case 0:
document.getElementByID("hours").innerHTML="Today's Hours: 2:00PM to 10:00PM";
break;
case 1:
case 2:
case 3:
case 4:
document.getElementById("hours").innerHTML="Today's Hours: 7:30AM to 10:00PM";
break;
case 5:
document.getElementById("hours").innerHTML="Today's Hours: 7:30AM to 4:00PM";
break;
case 6:
document.getElementById("hours").innerHTML="Closed Today";
break;
}
} else if (date_month >= '8/1') { //begin August intercession
switch (weekDay) {
case 0:
document.getElementById("hours").innerHTML="Closed Today";
break;
case 1:
case 2:
case 3:
case 4:
document.getElementById("hours").innerHTML="Today's Hours: 8:00AM to 4:30PM";
break;
case 5:
document.getElementById("hours").innerHTML="Today's Hours: 8:00AM to 4:00PM";
break;
case 6:
document.getElementById("hours").innerHTML="Closed Today";
break;
}
} else if (date_formatted >= '6/1/1') { //begin regular hours for summer
switch (weekDay) {
case 0:
document.getElementByID("hours").innerHTML="Today's Hours: 2:00PM to 10:00PM";
break;
case 1:
case 2:
case 3:
case 4:
document.getElementById("hours").innerHTML="Today's Hours: 7:30AM to 10:00PM";
break;
case 5:
document.getElementById("hours").innerHTML="Today's Hours: 7:30AM to 4:00PM";
break;
case 6:
document.getElementById("hours").innerHTML="Closed Today";
break;
}
} else if (date_formatted >= '5/2/1') { //begin May intercession
switch (weekDay) {
case 0:
document.getElementById("hours").innerHTML="Closed Today";
break;
case 1:
case 2:
case 3:
case 4:
document.getElementById("hours").innerHTML="Today's Hours: 8:00AM to 4:30PM";
break;
case 5:
document.getElementById("hours").innerHTML="Today's Hours: 8:00AM to 4:00PM";
break;
case 6:
document.getElementById("hours").innerHTML="Closed Today";
break;
}
} else if (date_formatted >= '5/1/1') { //begin Spring exam week
switch (weekDay) {
case 0:
document.getElementById("hours").innerHTML="Today's Hours: 2:00PM to 12:00PM";
break;
case 1:
case 2:
case 3:
case 4:
document.getElementById("hours").innerHTML="Today's Hours: 7:30AM to 12:00AM";
break;
case 5:
document.getElementById("hours").innerHTML="Today's Hours: 7:30AM to 4:00PM";
break;
case 6:
document.getElementById("hours").innerHTML="Closed Today";
break;
}
} else if (date_formatted >= '3/3/1') { //resume regular hours after Spring Break
switch (weekDay) {
case 0:
document.getElementByID("hours").innerHTML="Today's Hours: 2:00PM to 10:00PM";
break;
case 1:
case 2:
case 3:
case 4:
document.getElementById("hours").innerHTML="Today's Hours: 7:30AM to 10:00PM";
break;
case 5:
document.getElementById("hours").innerHTML="Today's Hours: 7:30AM to 4:00PM";
break;
case 6:
document.getElementById("hours").innerHTML="Closed Today";
break;
}
} else if (date_formatted >= '3/2/1') { //begin Spring Break
switch (weekDay) {
case 0:
document.getElementById("hours").innerHTML="Closed Today";
break;
case 1:
case 2:
case 3:
case 4:
document.getElementById("hours").innerHTML="Today's Hours: 8:00AM to 4:30PM";
break;
case 5:
document.getElementById("hours").innerHTML="Today's Hours: 8:00AM to 4:00PM";
break;
case 6:
document.getElementById("hours").innerHTML="Closed Today";
break;
}
} else if (date_formatted >= '1/2/1') { //begin Spring semester
switch (weekDay) {
case 0:
document.getElementByID("hours").innerHTML="Today's Hours: 2:00PM to 10:00PM";
break;
case 1:
case 2:
case 3:
case 4:
document.getElementById("hours").innerHTML="Today's Hours: 7:30AM to 10:00PM";
break;
case 5:
document.getElementById("hours").innerHTML="Today's Hours: 7:30AM to 4:00PM";
break;
case 6:
document.getElementById("hours").innerHTML="Closed Today";
break;
}
} else if (date_formatted >= '1/1/4') { //Winter intercession
switch (weekDay) {
case 0:
document.getElementById("hours").innerHTML="Closed Today";
break;
case 1:
case 2:
case 3:
case 4:
document.getElementById("hours").innerHTML="Today's Hours: 8:00AM to 4:30PM";
break;
case 5:
document.getElementById("hours").innerHTML="Today's Hours: 8:00AM to 4:00PM";
break;
case 6:
document.getElementById("hours").innerHTML="Closed Today";
break;
}
} else {
document.getElementByID("hours").innerHTML="<a href='http://www.deltastate.edu/academics/libraries/libraries-hours-of-operation/' target='_blank'>Click here for Library hours</a>";
}
那麼，你比較的字符串，而不是日期... –
你應該做的日期對象或數字的比較。不要使用格式化的日期字符串進行任何比較。 –
date_formatted> = '12/3/1'不是日期比較的正確方法，它只是一個字符串比較 – InferOn