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How do you find out the caller function in JavaScript?

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粉色の甜心
粉色の甜心 2020-11-21 17:46 
function main()
{
   Hello();
}

function Hello()
{
  // How do you find out the caller function is \'main\'?
}

Is there a way to find out the call

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30条回答
  • 礼貌的吻别
    2020-11-21 17:49

    As far as I know, we have 2 way for this from given sources like this-

    1. arguments.caller

      function whoCalled()
{
    if (arguments.caller == null)
       console.log('I was called from the global scope.');
    else
       console.log(arguments.caller + ' called me!');
}

    2. Function.caller

      function myFunc()
{
   if (myFunc.caller == null) {
      return 'The function was called from the top!';
   }
   else
   {
      return 'This function\'s caller was ' + myFunc.caller;
    }
}

    Think u have your answer :).

    0 讨论(0)
  • 眼角桃花
    2020-11-21 17:53

    Here, everything but the functionname is stripped from caller.toString(), with RegExp.

    <!DOCTYPE html>
<meta charset="UTF-8">
<title>Show the callers name</title><!-- This validates as html5! -->
<script>
main();
function main() { Hello(); }
function Hello(){
  var name = Hello.caller.toString().replace(/\s\([^#]+$|^[^\s]+\s/g,'');
  name = name.replace(/\s/g,'');
  if ( typeof window[name] !== 'function' )
    alert ("sorry, the type of "+name+" is "+ typeof window[name]);
  else
    alert ("The name of the "+typeof window[name]+" that called is "+name);
}
</script>
    0 讨论(0)
  • 盖世英雄少女心
    2020-11-21 17:53

    here is a function to get full stacktrace:

    function stacktrace() {
var f = stacktrace;
var stack = 'Stack trace:';
while (f) {
  stack += '\n' + f.name;
  f = f.caller;
}
return stack;
}
    0 讨论(0)
  • 情深已故
    2020-11-21 17:54

    If you are not going to run it in IE < 11 then console.trace() would suit.

    function main() {
    Hello();
}

function Hello() {
    console.trace()
}

main()
// Hello @ VM261:9
// main @ VM261:4
    0 讨论(0)
  • 我在风中等你
    2020-11-21 17:54

    Note you can't use Function.caller in Node.js, use caller-id package instead. For example:

    var callerId = require('caller-id');

function foo() {
    bar();
}
function bar() {
    var caller = callerId.getData();
    /*
    caller = {
        typeName: 'Object',
        functionName: 'foo',
        filePath: '/path/of/this/file.js',
        lineNumber: 5,
        topLevelFlag: true,
        nativeFlag: false,
        evalFlag: false
    }
    */
}
    0 讨论(0)
  • 别那么骄傲
    2020-11-21 17:55 
    function Hello() {
    alert(Hello.caller);
}
    0 讨论(0)
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