代码示例

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var xhr = new XMLHttpRequest();
var url = 'http://example.com';
xhr.open('GET',url,true);
xhr.onreadystatechange = function() {
		if (request.readyState !== 4)
			return;
		if (timeout)
			return;
		clearTimeout(timer);
		if (request.status === 200) {
			callback(request.responseText);
		}
	}
xhr.send();