fisrt

resources/js/app.js

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+require('./bootstrap');

resources/js/bootstrap.js

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+window._ = require('lodash');
+
+/**
+ * We'll load the axios HTTP library which allows us to easily issue requests
+ * to our Laravel back-end. This library automatically handles sending the
+ * CSRF token as a header based on the value of the "XSRF" token cookie.
+ */
+
+window.axios = require('axios');
+
+window.axios.defaults.headers.common['X-Requested-With'] = 'XMLHttpRequest';
+
+/**
+ * Echo exposes an expressive API for subscribing to channels and listening
+ * for events that are broadcast by Laravel. Echo and event broadcasting
+ * allows your team to easily build robust real-time web applications.
+ */
+
+// import Echo from 'laravel-echo';
+
+// window.Pusher = require('pusher-js');
+
+// window.Echo = new Echo({
+//     broadcaster: 'pusher',
+//     key: process.env.MIX_PUSHER_APP_KEY,
+//     cluster: process.env.MIX_PUSHER_APP_CLUSTER,
+//     forceTLS: true
+// });

resources/js/setStock.js

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+$('.join_identity_id').change(function (e) {
+    const val = $(this).val();
+    var commonThis = $(this);
+    if (val !== null) {
+        $.ajax({
+            type: "get",
+            data: {
+                'q': val,
+            },
+            url: "/admin/platform/identity_stock",
+            async: true,
+            success: (result => {
+                if (result.status_code == 200) {
+                    $('.stock').val(result.value);
+                } else {
+                    alert('获取库存失败');
+                }
+            })
+        });
+    }
+});