Question

我需要一些代码的布局方面的帮助。我可以通过function3和function1的参数以某种方式调用function2吗？我无法使function2成为嵌套函数，因为它由onclick激活。

谢谢！

function 1(){
//This function activates when a file is imported and calculates one variable from an imported document.
}
function 2(){
//The function activates from an "onclick()" this function calculates another variable.  
}
function 3(){
//calculation of the two variables
}

Answer 1

您可以在常用功能中创建两个变量＆＃39;范围并检查它们。像这样：

var firstVar = null;
var secondVar = null;

function fnc1(){
//This function activates when a file is imported and calculates one variable from an imported document.
    firstVar = importedVariable;
    if(secVar){
        fnc3();
    }
}
function fnc2(){
//The function activates from an "onclick()" this function calculates another variable.  
    secondVar = anotherVariable;
    if(firstVar){
        fnc3();
    }

}
function fnc3(){
//calculation of the two variables
    alert(firstVar + secondVar);
}

Answer 2

您可以使用Promise api来处理异步函数。

此外，您无法命名以数字开头的函数。

const element = document.querySelector('#click')

function one(arg) {
  return new Promise((resolve, reject) => {
    // get the file and pass the resolve function to it
    getTheFile(resolve)
  })
}
function two(arg) {
  return new Promise((resolve, reject) => {
    // bind your event inside the promise
    element.addEventListener('click', e => {         
      resolve(arg)
      console.log('click resolved')
    }, false)
  })
}

// callback when promises are resolved
function three([arg1, arg2]) {
  console.log('calc resolved', arg1 + arg2)
}


Promise.all([
  one(1),
  two(2)
]).then(three)

// ignore this
function getTheFile(resolve) {
  // get the file asynchronously
  setTimeout(() => {
    // get something from the file and pass it to resolve
    resolve(1)
    console.log('file resolved')
  }, 250)
}

<button id="click">Click</button>

Answer 3

function Handler() {
    this.foo = function(v) { this.a = v }
    this.bar = function(v) { this.b = v }
    this.baz = function() { return this.a + this.b }
}

h1 = new Handler()
h2 = new Handler()
h3 = new Handler()

h1.foo( 5 )
h1.bar( 6 )

h2.foo( 1 )
h2.bar( 2 )

h3.foo( 10 )
h3.bar( 20 )

print( h1.baz() )
print( h2.baz() )
print( h3.baz() )

使用来自两个不同函数

3 个答案: