1. 直接打开
2. button 点击后同步打开
window.open
a.click
form.submit
button.click
3. button 点击后延时打开
window.open
a.click
form.submit
button.click
4. button 点击后触发请求,请求回调中打开
window.open
a.click
form.submit
button.click
5. input keydown后直接打开
6. input keydown后延迟打开
7. input keydown后触发请求,请求回调中打开