需掌握的技能点：
jsonp、跨域相关等。
以下两种代码，均可直接运行。
1、使用原生JS：
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title></head><body> ???<p id="cur_year"></p> ???<div id="iciba_ds"></div></body></html><script type="text/javascript"> ???document.getElementById("cur_year").innerHTML =new Date(); ???function data(data){ ???????//遍历 ???????var description = ""; ???????for(var i in data.result){ ???????????var property=data.result[i]; ???????????description+=i+" = "+property+"<br />"; ???????} ???????document.write(description); ???}</script><script type="text/javascript" src="http://api.k780.com:88/?app=weather.today&weaid=412&&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json&jsoncallback=data"></script>2、使用jquery：
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title> ???<script type="text/javascript" src="jquery-3.3.1.min.js"></script> ???<script> ???????$(document).ready(function(){ ???????????$.ajax({ ???????????????type ?????????: ‘get‘, ???????????????async ????????: false, ???????????????url ??????????: ‘http://api.k780.com/?app=weather.today&weaid=412&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json&jsoncallback=data‘, ???????????????dataType ?????: ‘jsonp‘, ???????????????jsonp ????????: ‘callback‘, ???????????????jsonpCallback : ‘data‘, ???????????????success ??????: function(data){ ???????????????????if(data.success!=‘1‘){ ???????????????????????alert(data.msgid+‘ ‘+data.msg); ???????????????????????exit; ???????????????????} ???????????????????//遍历 ???????????????????var description = ""; ???????????????????for(var i in data.result){ ???????????????????????var property=data.result[i]; ???????????????????????description+=i+" = "+property+"<br />"; ???????????????????} ???????????????????document.write(description); ???????????????}, ???????????????error:function(){ ???????????????????alert(‘fail‘); ???????????????} ???????????}); ???????}); ???</script></head><body></body></html>原生JS和jQuery分别使用jsonp来获取“当前天气信息”
原文地址：https://www.cnblogs.com/mycognos/p/9222306.html