react 二次确认框
I've fallen in love with React.js and JSX over the years; state-based rendering and a logical workflow have made me see the light of this modern framework. That doesn't mean I don't sometimes get a bit frustrated that the "simple" things seem harder than they should be. Getting a reference to an element and modifying its properties used to be simple but now you have to take into account you don't usually have element references -- you need to think in a different way. I learned this when I needed to set a checkbox's inderterminate property, a property not recognized via an attribute, one that requires a handle on the element and setting a property directly.
这些年来，我爱上了React.js和JSX； 基于状态的渲染和合理的工作流程使我了解了这个现代框架。 这并不意味着我有时不会对“简单”的事情看起来比他们应该做的事情感到沮丧。 获取元素的引用并修改其属性以前很简单，但是现在您必须考虑到通常没有元素引用-您需要以不同的方式思考。 当我需要设置复选框的inderterminate属性时，我就学到了这一点，该属性无法通过属性识别，而该属性需要元素上的句柄并直接设置属性。
To add the indeterminate property to the checkbox, I needed to take advantage of the ref attribute:
要将indeterminate属性添加到复选框，我需要利用ref属性：
const { value, checked, indeterminate } = this.props return render( <input type="checkbox" value={value} checked={checked} ref={el => el && (el.indeterminate = indeterminate)} /> )Since the ref is run on each render, the indeterminate property is updated appropriately, and thus the checkbox appears as expected.
由于ref在每个渲染器上运行，因此indeterminate属性会适当更新，因此该复选框将按预期显示。
Regardless of how amazing your framework appears, there's always a blind spot that requires a bit of a hack to accomplish what's expected. That's what a framework does, though: gives you 99% of what you need and makes the 1% difficult!
无论您的框架看起来有多神奇，总会有一个盲点，需要一点技巧才能完成预期的工作。 不过，这就是框架所做的事情：为您提供99％的所需内容，使1％的工作变得困难！
翻译自: https://davidwalsh.name/react-indeterminate
react 二次确认框
相关资源：jdk-8u281-windows-x64.exe