ajax and cross-domain jsonp
This time I will bring you ajax and cross-domain jsonp. What are the precautions for ajax and cross-domain jsonp? The following is a practical case, let’s take a look.
nbsp;html>
<meta>
<title>Title</title>
<script>
window.onload =function(){
var oBtn = document.getElementById('btn');
oBtn.onclick = function(){
//创建XHR对象
var xhr = new XMLHttpRequest();
//请求的方式，地址，是否异步
xhr.open('get','test.txt',true);
//请求的确定操作，初始化，相当于搜索时，敲击的回车
xhr.send(null);
//请求的readyState每变化一次就执行一次onreadystatechange函数
//其中readyState表示的是：请求/响应过程的当前活动阶段
//readyState有如下取值
/*
* 0：未初始化，尚未调用send()方法
* 1: 启动
* 2：发送
* 3：接收
* 4：完成
*/
xhr.onreadystatechange =function(){
if(xhr.readyState ==4){
alert(xhr.responseText);
}
}
};
};
</script>
<input>
nbsp;html>
<meta>
<title>Title</title>
<style>
*{
margin: 0;
padding: 0;
}
input{
width:300px;
height:30px;
border:1px solid lightgray;
margin-top: 150px;
margin-left: 200px;
padding-left: 5px;
}
ul{
width:307px;
list-style: none;
margin-left: 200px;
display: none;
}
li{
height:30px;
border: 1px solid lightgray;
line-height: 30px;
padding-left: 5px;
}
</style>
<script>
function callbackD(response){
var oUl = document.getElementById('ulList');
var html='';
if(response.s.length !=0){
oUl.style.display='block';
for(var i = 0;i<response.s.length;i++){
html+='<li>'+response.s[i]+''
}
}
oUl.innerHTML = html;
}
</script>
<script>
window.onload = function(){
//获取dom元素
var oData = document.getElementById('inputSearch');
var oUl = document.getElementById('ulList');
//键盘按下后抬起触发事件(onkeyup)
oData.onkeyup = function(){
if(oData.value != ''){
//创建标签(createElement)
var script = document.createElement("script");
//添加地址
script.src='http://unionsug.baidu.com/su?wd='+this.value+'&p=3&cb=callbackD';
//添加给body的(成为body包涵的孩子)
document.body.appendChild(script);
}else{
oUl.style.display='none';
}
}
};
</script>
<input>
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