Make same function have different inputs

This question already has an answer here:

Function overloading in Javascript - Best practices 29 answers

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您可以使用arguments变量来检查参数的数量，如下所示：

function F(x, y) {
  if (arguments.length == 1) {
    say(x);
  } else if (arguments.length == 2) {
    run(x, y)
  }
}

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