是否有一种方法可以动态地获取函数的函数参数名?
假设我的函数是这样的
function doSomething(param1, param2, .... paramN){
// fill an array with the parameter name and value
// some other code
}
现在，我如何从函数内部获得参数名称及其值的列表到数组中?
当前回答
我不知道这个解决方案是否适合您的问题，但它允许您重新定义任何您想要的函数，而无需更改使用它的代码。现有调用将使用定位参数，而函数实现可能使用“命名参数”(单个散列参数)。
我认为你无论如何都会修改现有的函数定义，所以，为什么不拥有一个工厂函数，让你想要的东西:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script type="text/javascript">
var withNamedParams = function(params, lambda) {
return function() {
var named = {};
var max = arguments.length;
for (var i=0; i<max; i++) {
named[params[i]] = arguments[i];
}
return lambda(named);
};
};
var foo = withNamedParams(["a", "b", "c"], function(params) {
for (var param in params) {
alert(param + ": " + params[param]);
}
});
foo(1, 2, 3);
</script>
</head>
<body>
</body>
</html>
希望能有所帮助。
其他回答
无论哪种解决方案，它都不能破坏奇怪的函数，其toString()看起来也很奇怪:
function ( A, b
,c ,d
){}
另外，为什么要使用复杂的正则表达式?可以这样做:
function getArguments(f) {
return f.toString().split(')',1)[0].replace(/\s/g,'').substr(9).split(',');
}
这适用于每个函数，唯一的正则表达式是删除空白，由于.split技巧，它甚至不处理整个字符串。
下面我举个简单的例子:
function test(arg1,arg2){
var funcStr = test.toString()
var leftIndex = funcStr.indexOf('(');
var rightIndex = funcStr.indexOf(')');
var paramStr = funcStr.substr(leftIndex+1,rightIndex-leftIndex-1);
var params = paramStr.split(',');
for(param of params){
console.log(param); // arg1,arg2
}
}
test();
你可以使用"arguments"属性访问传递给函数的参数值。
function doSomething()
{
var args = doSomething.arguments;
var numArgs = args.length;
for(var i = 0 ; i < numArgs ; i++)
{
console.log("arg " + (i+1) + " = " + args[i]);
//console.log works with firefox + firebug
// you can use an alert to check in other browsers
}
}
doSomething(1, '2', {A:2}, [1,2,3]);
这个问题的答案需要3个步骤:
To get the values of the actual parameters passed to the function (let's call it argValues). This is straight forward as it will be available as arguments inside the function. To get the parameter names from the function signature (let's call it argNames). This not as easy and requires parsing the function. Instead of doing the complex regex yourself and worrying about edge cases (default parameters, comments, ...), you can use a library like babylon that will parse the function into an abstract syntax tree from which you can obtain the names of parameters. The last step is to join the 2 arrays together into 1 array that has the name and value of all the parameters.
代码是这样的
const babylon = require("babylon")
function doSomething(a, b, c) {
// get the values of passed argumenst
const argValues = arguments
// get the names of the arguments by parsing the function
const ast = babylon.parse(doSomething.toString())
const argNames = ast.program.body[0].params.map(node => node.name)
// join the 2 arrays, by looping over the longest of 2 arrays
const maxLen = Math.max(argNames.length, argValues.length)
const args = []
for (i = 0; i < maxLen; i++) {
args.push({name: argNames[i], value: argValues[i]})
}
console.log(args)
// implement the actual function here
}
doSomething(1, 2, 3, 4)
日志对象将为
[
{
"name": "a",
"value": 1
},
{
"name": "c",
"value": 3
},
{
"value": 4
}
]
下面是一个工作示例https://tonicdev.com/5763eb77a945f41300f62a79/5763eb77a945f41300f62a7a
我通常是怎么做的:
function name(arg1, arg2){
var args = arguments; // array: [arg1, arg2]
var objecArgOne = args[0].one;
}
name({one: "1", two: "2"}, "string");
你甚至可以通过函数名引用参数，比如:
name.arguments;
希望这能有所帮助!
