我的代码运行良好,但是有一个警告,我想消除“不要在循环中创建函数no-loop-func reactjs”
这是我的代码
renderOptions(categoryOptions) {
const renderData = []
let iterator = 0
// const subCategory = this.state.listSubcategorySelected
const { listSubcategory: subCategory = [], listCategory = [] } = this.props.showFilterRightText
for (const category in categoryOptions) {
const liData = []
renderData.push(
<ul key={`ul.${iterator}`} className="filter-box__collection has-title">
<li
key={`lii.${iterator}`}
className="filter-box__collection__title"
value={iterator}
onClick={this.showListOption(iterator)}
>
<span>{category}</span>
<i className="material-icons right-align font-size__18px">
{this.state.listOption[iterator] ? 'add' : 'remove'}
</i>
</li>
</ul>
)
const indexCategory = listCategory.indexOf(category)
categoryOptions[category].forEach((item, index) => {
let isCkecked = false
if (indexCategory >= 0) {
isCkecked = subCategory[indexCategory] && subCategory[indexCategory].indexOf(item) !== -1
}
liData.push(
<li key={`li${iterator}${index}`} className="filter-box__collection__item">
<input
id={item}
type="checkbox"
className="filled-in radio__is-for-filter"
checked={isCkecked !== undefined ? isCkecked : false}
onChange={this.handleChangeChk(category, item)}
/>
<label htmlFor={item}>{item}</label>
</li>
)
})
renderData.push(
<ul
key={`ull${iterator}`}
className="filter-box__collection"
style={{ display: this.state.listOption[iterator] ? 'none' : 'block' }}
>
{liData}
</ul>
)
iterator += 1
}
return renderData
}
控制台告诉我问题出在我发布的代码的第24行
const indexCategory = listCategory.indexOf(category)
categoryOptions[category].forEach((item, index) => {
任何可能对我有帮助的提示都将非常重要
答案 0 :(得分:2)
循环是for..of
循环,而react函数抱怨的是传递给forEach
箭头函数(item, index) =>
的那个。这可能比常规的for循环要慢一些,因为JS引擎必须在每次外部迭代时创建一个新的函数上下文,但是它只会慢一些,因此您可以放心地忽略警告。或者您使用常规的for循环:
for(const [item, index] of categoryOptions[category].entries()) {
//...
}