[英]how to make multi dimensional array with for loop?
FirstName = FirstName.value;
LastName = LastName.value;
Adress = Adress.value;
for(i=0 ;i<10;i++){
contacts[i] = [];
for(c=0;c<3;c++){
contacts[i].push(FirstName);
contacts[i].push(LastName);
contacts[i].push(Adress);
}
}
代碼為我提供了包含10個數組的contacts數組,每個數組具有重復3次的信息
您不需要第二個for
循環:
FirstName = FirstName.value;
LastName = LastName.value;
Adress = Adress.value;
for(i = 0; i < 10; i++) {
contacts[i] = [];
contacts[i].push(FirstName);
contacts[i].push(LastName);
contacts[i].push(Adress);
}
或者,您也可以使用這種方式:
FirstName = FirstName.value;
LastName = LastName.value;
Adress = Adress.value;
for(i = 0; i < 10; i++) {
contacts[i] = [FirstName, LastName, Adress];
}
我不確定目標,但我認為您應該使用對象而非二維數組來存儲信息。 ( 顯示二維數組和帶有對象的數組的Jsfiddle )。 所以代替
var contacts = [
['John', 'Doe', '100 Main Street'],
['Jane','Smith','101 Main']
];
你將會擁有
var contacts = [
{
first_name: 'John',
last_name: 'Doe',
address: '100 Main Street'
},
{
first_name: 'Jane',
last_name: 'Smith',
address: '101 Main Street'
}
];
嘗試這個。 它將表單名稱和電子郵件推送到聯系人
<form onsubmit='formSubmit(event);'>
<label>name</label>
<input id='name' value='John'/>
<label>email</label>
<input id='email' value='fake@test.com'/>
<br/>
<button>
add name and email
</button>
</form>
function formSubmit(event){
event.preventDefault();
contacts.push({
name: document.getElementById('name').value,
email: document.getElementById('email').value
})
console.log(contacts);
}
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