JavaScript用JSONP跨域请求数据实例详解

<script type="text/javascript">
 function httpGetAsync(theUrl, callback)
 {
 xmlHttp = null;
 if (window.XMLHttpRequest)
 {// code for IE7, Firefox, Opera, etc.
 xmlHttp = new XMLHttpRequest();
 }
 else if (window.ActiveXObject)
 {// code for IE6, IE5
 xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
 }
 if (xmlHttp != null)
 {
 xmlHttp.onreadystatechange = function() {
 if (xmlHttp.readyState == 4 && xmlHttp.status == 200)
 {
  callback(xmlHttp.responseText);
 }
 else
 {
  console.error("Problem retrieving XML data");
 }
 }
 xmlHttp.open("GET", theUrl, true); // true for asynchronous
 xmlHttp.setRequestHeader('Access-Control-Allow-Origin', '*');
 xmlHttp.send(null);
 }
 else
 {
 console.error("Your browser does not support XMLHTTP.");
 }
 }

 function showIcibaDS(ds_data)
 {
 // show daily sentence
 content = ds_data.content;
 note = ds_data.note;
 document.write(content + '<br>');
 document.write(note);
 }

 httpGetAsync("http://open.iciba.com/dsapi/", showIcibaDS);
</script>

XMLHttpRequest cannot load http://open.iciba.com/dsapi/. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access. The response had HTTP status code 501.

<script type="text/javascript">
 var cur_date = new Date();
 document.getElementById("cur_year").innerHTML = cur_date.getFullYear();

 function showIcibaDS(ds_data)
 {
 // show daily sentence
 content = ds_data.content;
 note = ds_data.note;
 ds_p = document.getElementById("iciba_ds")
 var content_span = document.createElement('span');
 var note_span = document.createElement('span');
 var br = document.createElement('br')
 content_span.innerHTML = content
 note_span.innerHTML = note
 ds_p.appendChild(content_span);
 ds_p.appendChild(br);
 ds_p.appendChild(note_span);
 }
</script>
<script type="text/javascript" src="/UploadFiles/2021-04-02/">

再查查资料，发现有人做了封装：


function jsonp(setting)
{
 setting.data = setting.data || {}
 setting.key = setting.key||'callback'
 setting.callback = setting.callback||function(){}
 setting.data[setting.key] = '__onGetData__'

 window.__onGetData__ = function(data) {
 setting.callback (data);
 }
 var script = document.createElement('script')
 var query = []
 for(var key in setting.data)
 {
 query.push(key + '=' + encodeURIComponent(setting.data[key])) 
 }
 script.src = setting.url + '"htmlcode">

<script src="/UploadFiles/2021-04-02/jquery-1.11.3.js">

总结
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作能带来一定的帮助，如果有疑问大家可以留言交流。
参考资料


https://www.jb51.net/article/75669.htm


https://zhuanlan.zhihu.com/p/22600501



                                
                                

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