js怎么让输入框自动获取焦点？

Question

element.focus()没用，没有光标闪动的聚焦效果，那该怎么做？

<input autofocus="autofocus" id="input">
//js
document.getElementById('input').focus();//我执行这句语句的时候光标没有自动聚焦，还是blur状态

Answer 1

trigger，模拟点击

Answer 2

autofocus HTML5
This Boolean attribute lets you specify that a form control should have input focus when the page loads, unless the user overrides it, for example by typing in a different control. Only one form element in a document can have the autofocus attribute, which is a Boolean. It cannot be applied if the type attribute is set to hidden (that is, you cannot automatically set focus to a hidden control).

给输入框加上这个属性就行了
mdn链接

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另外不明白为什么 element.focus()会没有用。不贴出代码无法解决，随手写了一下测试是有用的