回答編集履歴
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補足の追加。
answer
CHANGED
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@@ -2,4 +2,62 @@
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```JavaScript
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var taijyu = document.js.weight.value;
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taijyu = Number(taijyu);
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-
```
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```
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---
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**追記：**
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document. write は使わないようにしましょう。center要素はHTML5で非推奨です。
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```HTML
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<!DOCTYPE HTML>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="stylesheet" href="css/style.css">
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<style>
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.center {
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margin-top: 1em;
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text-align: center;
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}
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</style>
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</head>
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<body>
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<!-- <br /> brは文章の改行に使うものなので隙間を空けたければCSSで。 -->
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<form name="js">
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<div class="center">
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<p>あなたの体重は？</p>
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<div><input type="text" id="body" name="weight"></div>
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<div><input type="button" id="bt" value="決定ボタン"/></div>
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</div>
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</form>
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<div id="result" class="center"></div>
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<script language="javascript" type="text/javascript">
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var bt = document.getElementById( 'bt' );
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bt.addEventListener( 'click', function( e ) {
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var result = document.getElementById( 'result' );
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var taijyu = document.getElementById( 'body' ).value;
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taijyu = Number( taijyu );
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if ( taijyu < 60 ) {
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result.innerHTML = '軽すぎ';
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} else if( taijyu >= 60 && x < 70 ) {
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result.innerHTML = '理想のサイズです';
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} else {
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result.innerHTML = '重すぎ';
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}
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}, false );
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</script>
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<img src="images/sample.png">
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</body>
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</html>
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```
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【center 要素 - HTML | MDN】
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[https://developer.mozilla.org/ja/docs/Web/HTML/Element/center](https://developer.mozilla.org/ja/docs/Web/HTML/Element/center)
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【document . writeはやめて、innerHTMLを使おう | Web Developers Antenna ウェブ開発者アンテナ [W'ANEB]】
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[http://web.antenna.work/innerhtml/](http://web.antenna.work/innerhtml/)
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