这是两个不同的文件，其中 JavaScript 文件是从 html 页面引用的。
当我尝试两次运行代码时，它只运行 switch 语句的默认情况，而不运行其他情况。
THIS IS THE JAVASCRIPT FILE.
var gaadi = ["Santro", "Mercedes", "Maruti"];
var gaadi2 = ["Audi", "Honda", "Hyundai"];
var gaadi3 = ["Car1", "Car2"];
function selection()
{
var input;
input = document.getElementById("input").value;
switch (input)
{
case 0: function myFunction(){
var person ={firstName:"R",
lastName:"J",
id:2459,
fullName:function(){
x = 12.678;
return parseFloat(x);
}};
document.getElementById("demo").innerHTML=gaadi;
}
break;
case 1: function myFunction2(){
document.getElementById("demo").innerHTML = gaadi2;
}
break;
case 2: function myFunction3(){
var gaadimeet = gaadi.concat(gaadi2,gaadi3);
var gaadislice = gaadimeet.slice(2,5);
document.getElementById("demo").innerHTML= gaadimeet.sort();
document.getElementById("demo").innerHTML= gaadislice;
}
break;
case 3: function myFunction4()
{
if(gaadi[0] =="Santro") {
document.getElementById("demo").innerHTML = "There is car";
}
else {
document.getElementById("demo").innerHTML = "There is no such car";
}
}
break;
default: document.getElementById("demo").innerHTML="Sorry Wrong Input";
}
}
THIS IS THE HTML FILE<!DOCTYPE html>
<html>
<head>
<title>JavaScript</title>
</head>
<body>
<h1 id="demo">Display</h1>
<br>
<input id="input" value="0" />
<button onclick="selection()">Click Here</button>
<script src="myScript.js"></script>
</body>
</html>最佳答案
像 @Nasim Bahar 提到的第一个问题，你必须将 int 更改为字符串 make switch 才能知道你选择了哪些选项， 第二，如果我猜没有错的话，你想在切换到目标情况时触发 fn，对吗？ 如果是这样，你必须将你的 case 函数更改为 IIFE 函数，它会自行触发函数。
我只是为您对示例进行一些更改
case '0':(function myFunction(){
var person ={firstName:"R",
lastName:"J",
id:2459,
fullName:function(){
x = 12.678;
return parseFloat(x);
}};
document.getElementById("demo").innerHTML=gaadi;
})()
break;
以及下面的工作演示
var gaadi = ["Santro", "Mercedes", "Maruti"];
var gaadi2 = ["Audi", "Honda", "Hyundai"];
var gaadi3 = ["Car1", "Car2"];
function selection() {
var input;
input = document.getElementById("input").value;
switch (input) {
case '0': (function myFunction(){
var person ={firstName:"R",
lastName:"J",
id:2459,
fullName:function(){
x = 12.678;
return parseFloat(x);
}};
document.getElementById("demo").innerHTML=gaadi;
})()
break;
case '1': (function myFunction2(){
document.getElementById("demo").innerHTML = gaadi2;
})()
break;
case '2': (function myFunction3(){
var gaadimeet = gaadi.concat(gaadi2,gaadi3);
var gaadislice = gaadimeet.slice(2,5);
document.getElementById("demo").innerHTML= gaadimeet.sort();
document.getElementById("demo").innerHTML= gaadislice;
})()
break;
case '3': (function myFunction4()
{
if(gaadi[0] =="Santro") {
document.getElementById("demo").innerHTML = "There is car";
}
else {
document.getElementById("demo").innerHTML = "There is no such car";
}
})()
break;
default: document.getElementById("demo").innerHTML="Sorry Wrong Input";
}
}<h1 id="demo">Display</h1>
<br>
<input id="input" value="0" />
<button onclick="selection()">Click Here</button>关于javascript - 如何将输入值从 HTML 传递到 JavaScript 以用于切换包含函数的情况，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40668833/