回答編集履歴
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XMLHttpRequestのコード追記
answer
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@@ -1,7 +1,69 @@
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どこまで理解していてどの辺りで詰まっているのが不明ですが、`XMLHttpRequest` で JSON を
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どこまで理解していてどの辺りで詰まっているのが不明ですが、`XMLHttpRequest` で JSON を取得してください。
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```JavaScript
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'use strict';
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(function () {
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function handleReadystatechange (event) { // XMLHttpRequest Level 1
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var xhr = event.target, object;
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if (xhr.readyState === 4 && xhr.status === 200) {
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object = JSON.parse(xhr.responseText);
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console.dir(object);
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}
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}
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function createHandler (_handle, xhr) {
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return handle (event) {
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if (event) {
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event.target = xhr;
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} else {
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event = {target: xhr};
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}
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_handle.call(xhr, event);
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};
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}
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function handleLoad (event) { // XMLHttpRequest Level 2
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var xhr = event.target, object;
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if (xhr.status === 200) {
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object = JSON.parse(xhr.responseText);
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console.dir(object);
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}
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}
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function main () {
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var xhr = new XMLHttpRequest(); // for IE7+
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xhr.open('GET', 'data.json', true);
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if (typeof xhr.addEventListener === 'function') {
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if ('onload' in xhr) {
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xhr.addEventListener('load', handleLoad, false);
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} else if ('onreadystatechange' in xhr) {
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xhr.addEventListener('readystatechange', handleReadystatechange, false);
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}
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} else if (typeof xhr.attachEvent === 'function' || typeof xhr.attachEvent === 'object') { // for IE8-
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if ('onload' in xhr) {
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xhr.attachEvent('onload', createHandler(handleLoad, xhr));
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} else if ('onreadystatechange' in xhr) {
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xhr.attachEvent('onreadystatechange', createHandler(handleReadystatechange, xhr));
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}
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}
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xhr.send(null);
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}
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main();
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}());
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```
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JSON は `JSON.parse` で展開可能です。
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```JavaScript
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'use strict';
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var json = '[{"name":"青木","age":34},{"name":"イチロー","age":41}]',
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array = JSON.parse(json);
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