代码语言:javascript 代码运行次数:0 运行 AI代码解释 //假设我们定义一个人的类functionPerson(name){}// 方法-介绍你自己(使用this编写)Person.prototype.introduceYourselfWithThis=function(){if(Object.hasOwnProperty.call(this,'name')){return`My name is${this.name}`;}return`I have no name`;}// ...
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规则4——使用call/apply/bind方法显式指定this call/bind/apply这三个方法是javascript动态性的重要组成部分,后续的篇章会有详细的讲解。这里只看一下API用法,了解一下其对于this指向的影响: func.call(this, arg1, arg2...) func.apply(this, [arg1, arg2...]) func.bind(this[, arg1[, arg2[, ......
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JavaScript In the example above, when we passobj.greetingas a callback to the functionsayHello(), itsthiskeyword loses itsthisbinding toobjand points to the global object.this.greetis not referring toobj—instead it is referring to the global object. This can be solved by using thebind()me...
Functions in JavaScript have access to two inbuilt methods:applyandcall. func.apply(thisArg,argArray)func.call(thisArg,arg1,arg2,...) They allow us invoke a function and explicitly tie it to an object. Any object supplied to thethisArgparameter becomes the function context and what is referenc...
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pusher.user.watchlist.bind(eventName,callback); ∞Binding on the client You can also bind to events regardless of the channel the event is broadcast to. By using thepusher.bind()method rather thanchannel.bind(), you can listen for an event on all the channels that you are currently subscr...
is not implicitly interned as per the facts mentioned above). It's a compile-time optimization. This optimization doesn't apply to 3.7.x versions of CPython (check this issue for more discussion). A compile unit in an interactive environment like IPython consists of a single statement, wherea...
You can do so using an indirect function invocation or bind a function to a particular context:// Indirect function invocation myRegularFunc.call(myObject, 'Arg 1', 'Arg 2'); myRegularFunc.apply(myObject, 'Arg 1', 'Arg 2'); // Bound function const myBoundFunc = myRegularFunc.bind(...