var?getDOM?=?function(id){
	return?document.getElementById(id);
}
var?addEvent?=?function(id,event,fn){
	var?el?=?getDOM(id)?||?document;
	if?(el.addEventListener)?{
		el.addEventListener(event,fn,false);
	}?else?if(el.attachEvent)?{
		al.attachEvent('on'+event,fn);
	}
}
var?getElementLeft?=?function(element){
	var?actualLeft?=?element.offsetLeft;
	var?current?=?element.offsetParent;

	while(current?!==?null){
		actualLeft?+=?current.offsetLeft;
		current?=?current.offsetParent;
	}
	return?actualLeft;
}
var?getElementTop?=?function(element){
	var?actualTop?=?element.offsetTop;
	var?current?=?element.offsetParent;

	while(current?!==?null){
		actualTop?+=?current.offsetTop;
		current?=?current.offsetParent;
	}
	return?actualTop;
}
/*ajax*/
var?ajaxGet?=?function(url,callback){
	var?_xhr?=?null;
	if(window.XMLHttpRequest){
		_xhr?=?new?window.XMLHttpRequest();?//非IE
	}else?if(window.ActiveXObject){
		_xhr?=?new?ActiveXObject("Msxml2.XMLHTTP");?//IE下
	}
	_xhr.onreadystatechange?=?function(){
		if(_xhr.readyState?==?4?&&?_xhr.status?==?200){
			alert(11);
			callback(JSON.parse(_xhr.responseText));
		}
	}
	_xhr.open('get',url,false);
	_xhr.send(null);
}
/*事件代理*/
var?delegateEvent?=?function(target,event,fn){
	addEvent(document,event,function(e){
		if(e.target.nodeName?==?target.toUpperCase()){
			fn.call(e.target);
		}
	});
}
/*主體*/
addEvent('search-input','keyup',function(){
	var?searchText?=?getDOM('search-input').value;
	ajaxGet('http://api.bing.com/qsonhs.aspx?q='+searchText,function(v){
		var?d?=?v.AS.Results[0].Suggests;	
		var?html?=?'';		
		for?(var?i?=?0;?i?<?d.length;?i++)?{
			html?+=?'<li>'+d[i].Txt+'</li>';
		}
		getDOM('search-result').innerHTML?=?html;
		
		getDOM('search-suggest').style.top?=?getElementTop(getDOM('search-form'))+38+'px';
		getDOM('search-suggest').style.left?=?getElementLeft(getDOM('search-form'))+'px';
		getDOM('search-suggest').style.position?=?'absolute';
		getDOM('search-suggest').style.display?=?'block';
	});
});
delegateEvent('li','click',function(){
	var?keyword?=?this.innerHTML;
	location.href?=?'http://cn.bing.com/search?q='+keyword;
});

在搜索框輸入字符，調(diào)試顯示

js-script.js:47?XMLHttpRequest?cannot?load?http://api.bing.com/qsonhs.aspx?q=1.?
????No?'Access-Control-Allow-Origin'?header?is?present?on?the?requested?resource.?
????Origin?'null'?is?therefore?not?allowed?access.ajaxGet?@?js-script.js:47(anonymous?function)?@?js-script.js:60
js-script.js:47?Uncaught?NetworkError:?Failed?to?execute?'send'?on?'XMLHttpRequest':?
????Failed?to?load?'http://api.bing.com/qsonhs.aspx?q=1'.