让你的EstimationItem组件接受一个反 prop 。
App\View\Components\EstimationItem个

<?php

namespace App\View\Components;

use Illuminate\View\Component;

class EstimationItem extends Component
{
    public $cost;
    public $counter;

    public function __construct($cost, $counter) {
        $this->cost = $cost;
        $this->counter = $counter;
        $counter->increment();
    }
}

字符串
resources/views/components/estimation-item.blade.php个

@props([
    'cost',
    'counter'
])

<div>
    @foreach($cost->children as $child)
        {{ $counter->getValue() }}
        <x-estimation-item :cost="$child" :counter="$counter" />
    @endforeach
</div>

型
decompose一个Counter类来容器索引，并在每次呈现组件时递增索引。
App\Pojos\Counter个

namespace App\Pojos;

final class Counter {
    private int index;

    public function __construct() {
        $this->index = 0;
    }

    public function increment() {
        $this->index++;
    }

    public function getValue(): int {
        return $this->index;
    }
}

型
初始化计数器并将其作为prop传递给您的组件。

@php
$counter = new \App\Pojo\Counter();
@endphp

@foreach($costs as $cost)
   {{ $counter->getValue() }}
   <x-estimation-item :cost="$cost" :counter="$counter" />
@endforeach

型
你可以在操场上看到这一幕。