Javascript React JS 未捕获的引用错误：函数未定义
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React JS Uncaught Reference Error: function not defined
提问by janeeyrea
I am trying to call shuffleCards when the upon a click event in a ReactJs component. However, I am receiving the following error:
我试图在 ReactJs 组件中的点击事件时调用 shuffleCards。但是，我收到以下错误：
Uncaught ReferenceError: shuffleCards is not defined
Here's my code:
这是我的代码：
constructor(props) {
super(props);
this.state = {
count: 0
};
}
shuffleCards(array) {
var i = array.length,
j = 0,
temp;
while (i--) {
j = Math.floor(Math.random() * (i+1));
temp = array[i];
array[i] = array[j];
array[j] = temp;
}
return array;
}
handleClickEvent(event) {
var cards = [
{txt: "A",
isDisplayed: false},
{txt: "B",
isDisplayed: false},
{txt: "C",
isDisplayed: false}
];
if (this.state.count == 0) {
cards = shuffleCards(cards);
}
}
回答by nem035
EDITJust saw the comments and that zerkmsalready provided you with the solution. I'll leave my answer for clarification purposes.
编辑刚刚看到评论，zerkms已经为您提供了解决方案。为了澄清目的，我会留下我的答案。
你的问题是在里面
handleClickMethodhandleClickMethod，你打电话shuffleCardsshuffleCards而不是this.shuffleCardsthis.shuffleCardsshuffleCards(array) {
// ...
}
handleClickEvent(event) {
// ...
if (this.state.count == 0) {
cards = this.shuffleCards(cards); // here you should use `this.`
}
}
The reason is because shuffleCardsmethod is defined on your component, which is accessible from its methods via the thisproperty.
原因是因为shuffleCards方法是在您的组件上定义的，可以通过this属性从其方法访问。
If you defined shuffleCardswithin the handleClickMethod, then you could call it without accessing this:
如果定义shuffleCards范围内的handleClickMethod，那么你可以把它无需访问this：
handleClickEvent(event) {
function shuffleCards(array) {
// ...
}
// ...
if (this.state.count == 0) {
cards = shuffleCards(cards); // here you don't need `this.`
}
}
回答by Piotr Berebecki
Would this work for you? Demo here: http://codepen.io/PiotrBerebecki/pen/qaRdgX
这对你有用吗？演示在这里：http: //codepen.io/PiotrBerebecki/pen/qaRdgX
You missed thiswhen referring to shuffleCardsin the handleClickEventmethod.
您在方法中this提到时错过shuffleCards了handleClickEvent。
shuffleCards(array) {
// logic here
}
handleClickEvent(event) {
cards = this.shuffleCards(cards);
}
render() {
return (
<button onClick={this.handleClickEvent.bind(this)}>Click me</button>
);
}
回答by Burak
I had the same problem.
我有同样的问题。
And i upgrade "react-scripts" and fix this problem.
我升级了“ react-scripts”并解决了这个问题。
Probaply fix this.
大概解决这个问题。
npm i react-scripts
