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   源码介绍

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function $(id) {
	return document.getElementById(id);
}

var ipt = $("ipt");
var ser = $("ser_box");
var bot = $("bot_box");
var oul = $("oul");


ipt.oninput = function() {
	var ss = ipt.value;
	var url = "http://suggestion.baidu.com/su?cb=queryList&wd="   ss;
	addScript(url);
}

ipt.onfocus = function() {
	var ss = ipt.value;
	var url = "http://suggestion.baidu.com/su?cb=queryList&wd="   ss;
	addScript(url);

}

function queryList(data) {
	ss=document.getElementsByTagName("script")[0];
	document.body.removeChild(ss)
	
	var arr = data.s;
	oul.innerHTML = "";
	if(arr.length == 0) {
		bot.style.display = "none";
	} else {
		bot.style.display = "block";
	}

	for(var i = 0; i < arr.length; i  ) {
		li = document.createElement("li");
		li.innerHTML = arr[i];
		li.onclick = function() {
			oul.innerHTML = "";
			ipt.value = this.innerHTML;
			bot.style.display = "none";
		}
		oul.appendChild(li);
	}
}

function addScript(url) {
	var s = document.createElement("script");
	s.src = url;
	s.type = "text/javascript";
	document.body.appendChild(s);
}

/*取li*/

lis = document.getElementsByTagName("li");

/*按键*/
var i = 0;

document.onkeydown = function(ev) {

	if(bot.style.display == "block") {
		

		if(ev.keyCode == 40) {
			for(var j = 0; j < lis.length; j  ) {
				if(lis[j].className == "sel") {
					lis[j].className = "";
				}
			}

			if(i < lis.length) {
				lis[i].className = "sel";
				i  ;
				if(i == lis.length) {
					i = 0;
				}
			}
		}

		if(ev.keyCode == 38) {
			m = 0
			for(; m < lis.length; m  ) {
				if(lis[m].className == "sel") {
					lis[m].className = "";
					break;
				}
			}
			i = m;
			if(m > 0) {
				lis[m - 1].className = "sel";
			} else {
				lis[lis.length - 1].className = "sel";
			}
		}

		
		
		
		if(ev.keyCode == 13) {
			for(var n = 0; n < lis.length; n  ) {
				if(lis[n].className == "sel") {
					ipt.value = lis[n].innerHTML;
				}
			}
			bot.style.display = "none";
		}
	} else {
		i = 0;
		m = 0;
	}
}