Javascript React组件中应有意外标记
我有一个反应组件,看起来像这样Javascript React组件中应有意外标记,javascript,reactjs,bind,babeljs,Javascript,Reactjs,Bind,Babeljs,我有一个反应组件,看起来像这样 'use strict'; import 'babel-polyfill'; import React from 'react'; import TreeNode from './TreeView'; export default React.createClass({ mapFromApi : function(data) { const rec = (tree) => tree.reduce((x,y) => {
'use strict';
import 'babel-polyfill';
import React from 'react';
import TreeNode from './TreeView';
export default React.createClass({
mapFromApi : function(data) {
const rec = (tree) => tree.reduce((x,y) => {
const newObj = {
"id" : y["@id"],
"name" : y["rdfs:label"]
};
if (y.hasOwnProperty("options")) {
newObj.children = rec(y.options, []);
}
if (y.hasOwnProperty("children")) {
newObj.children = rec(y.children, []);
}
x.push(newObj);
return x;
}, []);
let t = rec(data);
return t;
},
render: function (data) {
let tree1 = this.mapFromApi(this.props.data.properties).map(child => {
return <TreeNode key={child['id']} data={child}/>;
}.bind(this));
return (
<div className='vocab'>
<h4>vocab1</h4>
<div className='accordion'>
{tree1}
</div>
</div>
);
}
});
const {data} = this.props;
let tree1 = this.mapFromApi(data.properties).map(child => {
return <TreeNode key={child['id']} data={child}/>;
});
“严格使用”;
进口“babel polyfill”;
从“React”导入React;
从“/TreeView”导入TreeNode;
导出默认的React.createClass({
mapFromApi:函数(数据){
const rec=(tree)=>tree.reduce((x,y)=>{
常数newObj={
“id”:y[“@id”],
“名称”:y[“rdfs:标签”]
};
如果(y.hasOwnProperty(“期权”)){
newObj.children=rec(y.options,[]);
}
如果(y.hasOwnProperty(“子女”)){
newObj.children=rec(y.children,[]);
}
x、 推(newObj);
返回x;
}, []);
设t=rec(数据);
返回t;
},
渲染:函数(数据){
让tree1=this.mapFromApi(this.props.data.properties).map(child=>{
返回;
}.约束(这个);
返回(
声音1
{tree1}
);
}
});
运行此命令时,bind关键字出现错误
SyntaxError: App.jsx: Unexpected token, expected , (56:5)
54 | let tree1 = this.mapFromApi(this.props.data.properties).map(child => {
55 | return <TreeNode key={child['id']} data={child}/>;
> 56 | }.bind(this));
| ^
57 |
58 | return (
59 | <div className='vocab'>
SyntaxError:App.jsx:意外标记,应为(56:5)
54 |让tree1=this.mapFromApi(this.props.data.properties).map(child=>{
55 |返回;
>绑定(这个);
| ^
57 |
58 |返回(
59 |
我不确定这是否与我的Babel设置有关,我对整个es版本的情况非常困惑
有人能帮我解决这个问题吗?非常感谢。您不需要使用。绑定(此),因为您正在使用ES6
箭头
函数=>,这将引用正确的此
我会写这样的东西
'use strict';
import 'babel-polyfill';
import React from 'react';
import TreeNode from './TreeView';
export default React.createClass({
mapFromApi : function(data) {
const rec = (tree) => tree.reduce((x,y) => {
const newObj = {
"id" : y["@id"],
"name" : y["rdfs:label"]
};
if (y.hasOwnProperty("options")) {
newObj.children = rec(y.options, []);
}
if (y.hasOwnProperty("children")) {
newObj.children = rec(y.children, []);
}
x.push(newObj);
return x;
}, []);
let t = rec(data);
return t;
},
render: function (data) {
let tree1 = this.mapFromApi(this.props.data.properties).map(child => {
return <TreeNode key={child['id']} data={child}/>;
}.bind(this));
return (
<div className='vocab'>
<h4>vocab1</h4>
<div className='accordion'>
{tree1}
</div>
</div>
);
}
});
const {data} = this.props;
let tree1 = this.mapFromApi(data.properties).map(child => {
return <TreeNode key={child['id']} data={child}/>;
});
const{data}=this.props;
让tree1=this.mapFromApi(data.properties).map(child=>{
返回;
});
如果简化代码的布局方式,这些语法错误应该更容易识别
let { data } = this.props;
this
.mapFromApi(data.properties)
.map(child => <TreeNode key={child.id} data={child} />)
let{data}=this.props;
这
.mapFromApi(data.properties)
.map(子项=>)
arrow函数已经将为您绑定(此)
,因此您可以忽略它。谢谢我在阅读您关于此问题的文章后意识到了这一点。也谢谢您。在阅读Dan的文章后,我对bind有了更多的了解。这就是我的代码现在的样子。由于arrow函数,我不必绑定。