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node_modules/vant/es/mixins/popup/context.js

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+export var context = {
+  zIndex: 2000,
+  lockCount: 0,
+  stack: [],
+  find: function find(vm) {
+    return this.stack.filter(function (item) {
+      return item.vm === vm;
+    })[0];
+  },
+  remove: function remove(vm) {
+    var item = this.find(vm);
+    if (!item) return;
+    item.vm = null;
+    item.overlay = null;
+    var index = this.stack.indexOf(item);
+    this.stack.splice(index, 1);
+  }
+};