代表者の戯言

Think about Array



VB

This isn't limited to JavaScript, but I'd like to introduce how to write data arrays in JavaScript.

There are two main ways to create arrays: one is to insert data first so that it's eventually recognized as an array, and the other is to declare it as an array first and then insert the data afterward.


<!DOCTYPE html>

<html lang="ja">

<head>

<meta charset="UTF-8">

<title>配列について検討する</title>

<link rel="stylesheet" href="reset.css">

<link rel="stylesheet" href="main.css">

</head>

<body>

<div class="container">

<form>

<input type="text" id="t1" placeholder="ここに表示">

<button id="button1">ボタン1<id="button1">

</button>

<input type="button" value="ボタン2" onclick="disp()">

<script>

/*方法1) insert data before making Array*/

var a=["山田太郎","ヤマダタロウ","23"];

var b;

b=a[2];

/*方法2) making Array before inserting Data*/

var c=new Array("東京花子","トウキョウハナコ","21");

var d;

d=c[1];

document.getElementById("button1").addEventListener("click", function () {

event.preventDefault();

document.getElementById("t1").value = b;

});

function disp() {

document.getElementById("t1").value = d;

}

</script>

</form>

</div>

</body>

</html>