我正在创建一个为期12天的圣诞节javascript程序,当我打印出该语句时,它会不断重复该语句。您能给我任何有关如何解决此问题并使程序正常运行的建议吗?
var day = ["first", "second", "third", "fourth", "fifth", "sixth",
"seventh", "eighth", "ninth", "tenth", "eleventh", "twelfth"];
var song = "";
for (var x = 0; x <= 13; x++) {
song += "On the " + day[x] + " day of Christmas";
song += " my true love gave to me: ";
if (x == 0) {
song += "a partridge in a pear tree."
}
else {
switch (x) {
case 12:
song += ("twelve drummers drumming, ");
case 11:
song += ("eleven pipers piping, ");
case 10:
song += ("ten lords a-leping, ");
case 9:
song += ("nine ladies dancing, ");
case 8:
song += ("eight maids a-milking, ");
case 7:
song += ("seven swans a-swimming, ");
case 6:
song += ("six geese a-laying, ");
case 5:
song += ("five gold rings,");
case 4:
song += ("four calling birds, ");
case 3:
song += ("three french hens, ");
case 2:
song += ("two turtle doves ");
case 1:
song += ("and a partridge in a pear tree.");
break;
}
}
console.log(song);}
答案 0 :(得分:4)
在切换案例中缺少break语句。
switch (x) {
case 12:
song += ("twelve drummers drumming, ");
break;
case 11:
song += ("eleven pipers piping, ");
break;
case 10:
song += ("ten lords a-leping, ");
break;
case 9:
song += ("nine ladies dancing, ");
break;
case 8:
song += ("eight maids a-milking, ");
break;
case 7:
song += ("seven swans a-swimming, ");
break;
case 6:
song += ("six geese a-laying, ");
break;
case 5:
song += ("five gold rings,");
break;
case 4:
song += ("four calling birds, ");
break;
case 3:
song += ("three french hens, ");
break;
case 2:
song += ("two turtle doves ");
break;
case 1:
song += ("and a partridge in a pear tree.");
break;
}
答案 1 :(得分:0)
在switch语句中,您错过了break
语句。另外,您可以将x==0
大小写放在开关本身上,而无需为此使用单独的if语句。
答案 2 :(得分:0)
您的switch语句需要在大小写之间进行换行,并且在循环开始时还需要将song变量设置为空,而且您的switch case需要从零开始,因此每次都会获取正确的case:
for (var x = 0; x < 12; x++) {
song = "";
song += "On the " + day[x] + " day of Christmas";
song += " my true love gave to me: ";
if (x == 0) {
song += "a partridge in a pear tree."
}
else {
switch (x) {
case 11:
song += ("twelve drummers drumming, ");
break;
case 10:
song += ("eleven pipers piping, ");
break;
case 9:
song += ("ten lords a-leping, ");
break;
case 8:
song += ("nine ladies dancing, ");
break;
case 7:
song += ("eight maids a-milking, ");
break;
case 6:
song += ("seven swans a-swimming, ");
break;
case 5:
song += ("six geese a-laying, ");
break;
case 4:
song += ("five gold rings,");
break;
case 3:
song += ("four calling birds, ");
break;
case 2:
song += ("three french hens, ");
break;
case 1:
song += ("two turtle doves ");
break;
case 0:
song += ("and a partridge in a pear tree.");
break;
default:
}
}
console.log(song);
}
答案 3 :(得分:0)
var day = ["first", "second", "third", "fourth", "fifth", "sixth",
"seventh", "eighth", "ninth", "tenth", "eleventh", "twelfth"];
var dayMessages = ["a partridge in a pear tree.", "and a partridge in a pear tree.", "two turtle doves ", "three french hens, ", "four calling birds, ", "five gold rings,", "six geese a-laying, ",
"seven swans a-swimming, ", "eight maids a-milking, ", "ten lords a-leping, ", "ten lords a-leping, ", "eleven pipers piping, ", "twelve drummers drumming, "];
var song = "";
for (var x = 0; x <= 13; x++) {
song = "On the " + day[x] + " day of Christmas";
song += " my true love gave to me: ";
song += dayMessages[x];
console.log(song);
}