如何在javascript中调用同一函数内部的函数 [英] How to call a function inside same function and outside in javascript

问题描述

我想在同一个函数内外调用一个函数。如何在javascript中使用？

I want to call a function inside that same function and outside also. How does it in javascript?

Js：

someFunction(function repeat(result) {
    document.body.innerHTML += '<br>' + result.winner;
    if (result.winner) {
        someFunction(repeat);
    }
});
someFunction.repeat();

推荐答案

var someFunction = function( callback ) {
  // Do some things that belong to someFunction, like creating the result object.
  var result = {
    winner: true
  };
  // Call the repeat function, using the result as the parameter.
  callback( result );
};
var endless_loop_protection = 0;
var repeat = function( result ) {
  // Write the result somewhere
  console.log( result.winner + ': ' + endless_loop_protection );
  // faking the if clauses that prevent the endless loop.
  endless_loop_protection += 1;
  if ( result.winner && endless_loop_protection < 10 ) {
    // Do everything again if there's still a winner in the result.
    someFunction( repeat );
  }
};
someFunction( repeat );

根据someFunction函数和repeat函数的确切含义，这样的结构可以更好地工作：

Depending on what exactly else is inside the someFunction function and the repeat function, a structure like this could work better:

var get_result = function() {
  // Create a random result.
  return {
    winner: Math.random() < 0.5
  };
};
// This will keep looping until get_result returns a result with winner = true.
// So the amount of times this will log is random each time you call it.
var handle_results_until_winner = function( get_result ) {
  var result = get_result();
  console.log( result.winner );
  if ( !result.winner ) handle_results_until_winner( get_result );
};
handle_results_until_winner( get_result );

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