[英]I want to give each of my array element a number
我有这段代码,一个问题是它列出了单个数组元素而不是整个数组的数字。
我尝试了其他方法,包括.map,但失败了。
让名字=“ Bilbo,Gandalf,Nazgul,Bob,Grim,Laniakea,Dzevid,Levan,George,What”;
let arr = names.split(', ');
for (let name of arr) {
for(let i =1; i < arr.length; i++)
document.write( i + ` A message to ${name}.` + `<br>` ); // A message to Bilbo (and other names)
}
使用此代码的结果是:
1 A message to Bilbo. 2 A message to Bilbo. 3 A message to Bilbo. 4 A message to Bilbo. 5 A message to Bilbo. 6 A message to Bilbo. 7 A message to Bilbo. 8 A message to Bilbo. 9 A message to Bilbo. 1 A message to Gandalf. 2 A message to Gandalf. 3 A message to Gandalf. 4 A message to Gandalf. 5 A message to Gandalf. 6 A message to Gandalf. 7 A message to Gandalf. 8 A message to Gandalf. 9 A message to Gandalf. 1 A message to Nazgul. 2 A message to Nazgul. 3 A message to Nazgul. 4 A message to Nazgul. 5 A message to Nazgul. 6 A message to Nazgul. 7 A message to Nazgul. 8 A message to Nazgul. 9 A message to Nazgul. 1 A message to Bob. 2 A message to Bob. 3 A message to Bob. 4 A message to Bob. 5 A message to Bob. 6 A message to Bob. 7 A message to Bob. 8 A message to Bob. 9 A message to Bob. 1 A message to Grim. 2 A message to Grim. 3 A message to Grim. 4 A message to Grim. 5 A message to Grim. 6 A message to Grim. 7 A message to Grim. 8 A message to Grim. 9 A message to Grim. 1 A message to Laniakea. 2 A message to Laniakea. 3 A message to Laniakea. 4 A message to Laniakea. 5 A message to Laniakea. 6 A message to Laniakea. 7 A message to Laniakea. 8 A message to Laniakea. 9 A message to Laniakea. 1 A message to Dzevid. 2 A message to Dzevid. 3 A message to Dzevid. 4 A message to Dzevid. 5 A message to Dzevid. 6 A message to Dzevid. 7 A message to Dzevid. 8 A message to Dzevid. 9 A message to Dzevid. 1 A message to Levan. 2 A message to Levan. 3 A message to Levan. 4 A message to Levan. 5 A message to Levan. 6 A message to Levan. 7 A message to Levan. 8 A message to Levan. 9 A message to Levan. 1 A message to George. 2 A message to George. 3 A message to George. 4 A message to George. 5 A message to George. 6 A message to George. 7 A message to George. 8 A message to George. 9 A message to George. 1 A message to What. 2 A message to What. 3 A message to What. 4 A message to What. 5 A message to What. 6 A message to What. 7 A message to What. 8 A message to What. 9 A message to What.
我希望它以以下方式工作:
1 A message to Bilbo
2 A message to Gandalf
3 A message to Nazgul
4 A message to Bob
5 A message to Grim
6 A message to Laniakea
7 A message to Dzevid
8 A message to Levan
9 A message to George
10 A message to what
不确定您要达到的目标。 但是这是可以提供帮助的代码。
let names = 'Bilbo, Gandalf, Nazgul, Bob, Grim, Laniakea, Dzevid, Levan, George, What';\
names = names.split(',');
names.forEach((name, index) => {
document.write(`${index} A message to ${name.trim()}`);
})
在此示例中,我们首先将长字符串转换为名称数组。 然后使用简单的forEach
处理每个名称。 请注意,我使用name.trim()
删除拆分后剩余的不必要空间。
实际上,不需要添加for (let name of arr) { .... }
。 您可以删除该行。 除此之外,您需要从i = 0
开始循环,因为数组从index 0
开始,
let names = 'Bilbo, Gandalf, Nazgul, Bob, Grim, Laniakea, Dzevid, Levan, George, What';
let arr = names.split(', ');
for(let i = 0; i < arr.length; i++){
document.write( `${i+1}` + ` A message to ${arr[i]}.` + `<br>` );
}
为什么要使用第二个循环? 像这样设置一个计数器
let names = 'Bilbo, Gandalf, Nazgul, Bob, Grim, Laniakea, Dzevid, Levan, George, What';
let arr = names.split(', ');
let count = 1;
for (let name of arr) {
document.write( count + ` A message to ${name}.` + `<br>` );
count++;
}
要么
for (i = 1; i < arr.length; i++) {
document.write( i + ` A message to ${name}.` + `<br>` );
}
您可以使用地图进行循环,并且不需要第二次循环,因为arr
是一维数组
let names = 'Bilbo, Gandalf, Nazgul, Bob, Grim, Laniakea, Dzevid, Levan, George, What'; let arr = names.split(', '); arr.map((d, i)=>{ document.write( i+1 + ` A message to ${d}.` + `<br>` ); // A message to Bilbo (and other names) })
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