Question

由于其中有this，我自己无法手动调用回调函数。我不太擅长JS，这是我在JS中要做的唯一一件事。有一种简单的方法可以调用该函数吗？

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id: "recaptcha-element-container",
className: t
}))
}, t.prototype.reset = function() {
  null !== this.state.widgetId && window.grecaptcha && window.grecaptcha.reset(this.state.widgetId)
}, t.prototype.execute = function() {
  null !== this.state.widgetId && window.grecaptcha && this.props.invisible && window.grecaptcha.execute(this.state.widgetId)
}, t.prototype.initRecaptcha = function() {
  if (window.grecaptcha) {
    var e = window.grecaptcha.render("recaptcha-element-container", {
      sitekey: this.props.invisible ? c.p.config.invisibleCaptchaKey : c.p.config.captchaKey,
      callback: this.onChange,
      theme: "light",
      type: "image",
      size: this.props.invisible ? "invisible" : "normal",
      tabindex: 0,
      hl: this.props.languageCode,
      badge: "bottomright",
      "expired-callback": this.onExpired
    });
    this.setState({
      widgetId: e
    })
  }
}, t

Answer 1

正在被回调的功能，将其更改为窗口。为了指定什么是“ this”，您可以使用“ bind”中的任何一种，此处对此进行了全面描述：

Use of the JavaScript 'bind' method https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind

或者var this = that pattern

What does 'var that = this;' mean in JavaScript?

如果使用ECMA6及更高版本，则使用箭头功能将在“此”下为您提供预期的变量

What does arrow function '() => {}' mean in Javascript? What does "this" refer to in arrow functions in ES6?

带有“ this”的javascript回调

1 个答案: