From 9f1f925fc1fd48a85b8bc5c9211229fbfe6a209d Mon Sep 17 00:00:00 2001 From: chua Date: Tue, 15 Sep 2020 21:02:41 +0800 Subject: [PATCH] Update proxy.md MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 添加handler.construct中对于this的描述 --- docs/proxy.md | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/docs/proxy.md b/docs/proxy.md index 3f5b841..5e76b9e 100644 --- a/docs/proxy.md +++ b/docs/proxy.md @@ -643,6 +643,18 @@ new p() // 报错 // Uncaught TypeError: 'construct' on proxy: trap returned non-object ('1') ``` +`construct()`方法中的`this`指向的是handler +``` +var handler = { + construct: function(target, args) { + console.log(this === handler); + return new target(...args); + } +} +var p = new Proxy(function() {}, handler); +new p() // true +``` + ### deleteProperty() `deleteProperty`方法用于拦截`delete`操作,如果这个方法抛出错误或者返回`false`,当前属性就无法被`delete`命令删除。