从函数

Question

是否可以从函数中断执行程序，或者我需要检查boolean val返回？

代码

function check(something) {

    if (!something) return;
    // Else pass and program continuing
}

check(false); // I want to stop execution because function has returned
// Or I need to check value like if (!check(false)) return; ?
// I want easiest possible without re-check value of function..

alert("hello");

Answer 1

一种方法是通过Error，否则你需要使用布尔检查，是的。我建议使用布尔值

function check(something) {

    if (!something) throw "";
    // Else pass and program continuing
}

check(false); // I want to stop execution because function has returned
// Or I need to check value like if (!check(false)) return; ?
// I want easiest possible without re-check value of function..

alert("hello");

Answer 2

...最简单

(function(){
  function check(something) {

    if (!something) return false;
    // Else pass and program continuing
  }

  if(!check(false)) return; 

  alert("hello");
});

(function(){ ... });被称为IIFE立即调用的函数表达式。

Answer 3

将您的代码放入IIFE，然后您可以使用return

(function() {
    function check(something) {
        if (!something) {
            return false;
        } else {
            return true;
        }
    }

    if (!check(false)) {
        return;
    }

    alert("hello");
});