Question

我在我的React Class组件中输入了内容

changeVal(event) {
  console.log(event.keyKode)
}
...

return(
   <input onKeyDown={event => this.changeVal(event)} />
)

如何在不使用lodash的情况下以500ms的去抖动在keyDown上调用函数？

我尝试了下一件事：

debounce = (callback, delay) => {
    const timerClear = () => clear = true;
    var clear = true;
    return event => {
        if (clear) { 
            clear = false;
            setTimeout(timerClear, delay);
            callback(event);
        }
    }
}

return(
   <input onKeyDown={event => this.debounce(this.changeVal, 500)} />
)

但这根本不起作用。

Answer 1

尝试

/dashboard

Answer 2

debounce函数的返回值应直接用作处理程序。在此处查看示例：https://codesandbox.io/s/musing-dust-iy7tq

class App extends React.Component {
  changeVal(event) {
    console.log(event.keyCode)
  }

  debounce = (callback, delay) => {
    const timerClear = () => clear = true;
    var clear = true;
    return event => {
        if (clear) { 
            clear = false;
            setTimeout(timerClear, delay);
            callback(event);
        }
    }
}

  render() {
    return(
       <input onKeyDown={this.debounce(this.changeVal, 1500)} />
    )
  }
}

反应：为onKeyDown事件反跳

2 个答案: