我是 ReactJS 的新手，正在尝试一个简单的项目。基本上，该代码段从数组中创建一个朋友列表并显示朋友的总数。
出于某种原因，当我添加一个新朋友时，我意识到 incrementFriendsCount 函数会抛出“最大调用堆栈超出错误”
下面的代码片段也可以在 JSFiddle 上找到。
var HelloUser = React.createClass({
getInitialState: function() {
return {
name: "Toyosi",
friends: ["Susanna", "Jibola", "Worreva"],
friendsCount: 0
}
},
addFriends: function(friend) {
this.setState({
friends: this.state.friends.concat([friend])
});
},
componentWillMount: function() {
this.setState({
friendsCount: this.state.friends.length
});
},
incrementFriendsCount: function() {
this.setState({
friendsCount: this.state.friends.length
});
},
render: function() {
return ( < div >
Villain: {
this.state.name
}, No of friends: {
this.state.friendsCount
} < br / >
< AddingTheFriend addNew = {
this.addFriends
}
incCount = {
this.incrementFriendsCount
}
/>
<ListFriends enemies={this.state.friends} / >
< /div>
);
}
});
var ListFriends = React.createClass({
propTypes: {
enemies: React.PropTypes.array.isRequired
},
render: function() {
var allFriends = this.props.enemies.map(function(friend){
return <li>{friend}</li > ;
});
return ( < div > Her evil friends:
< ul > {
allFriends
} < /ul>
</div >
)
}
});
var AddingTheFriend = React.createClass({
getInitialState: function() {
return {
newFriend: ''
}
},
propTypes: {
addNew: React.PropTypes.func.isRequired
},
updateNewFriend: function(change) {
this.setState({
newFriend: change.target.value
});
},
addTheFriend: function() {
this.props.addNew(this.state.newFriend);
this.setState({
newFriend: ''
})
},
componentWillReceiveProps: function() {
this.props.incCount();
},
render: function() {
return ( < div >
< input type = "text"
value = {
this.state.newFriend
}
onChange = {
this.updateNewFriend
}
/>
<button type="button" onClick={this.addTheFriend}>Add Friend</button >
< /div>
)
}
});
React.render(<HelloUser / > , document.getElementById('app'));<script src="http://fb.me/react-js-fiddle-integration.js"></script>
<div id="app"></div>如果有人能更多地了解为什么会抛出这个错误，我将不胜感激。