为什么我的循环在数字为 0 时停止？
[英]Why does my loop stop when the number is 0?
问题描述
function enigma(inputValue) { var i = 0; while (inputValue) { if (++i == 5) inputValue = 0; } return i; } var whatAmI = enigma(5); console.log(whatAmI);
<div>Hit F12 and go to the console to view output.</div>
The output I get is 5.
我得到的输出是 5。
Why does JavaScript stop the loop if inputValue equals 0?为什么如果inputValue等于 0，JavaScript 会停止循环？ Is this because I did not specify that as the condition in the while loop?这是因为我没有将其指定为 while 循环中的条件吗？
2 个解决方案
解决方案1
0 2015-11-01 11:35:48
0 is false. 0 是假的。 You can check here你可以在这里查看
解决方案2
0 2015-11-03 16:59:07
This explains the basics of a while loop.这解释了 while 循环的基础知识。 The condition within the while loop checks if it is truthy/falsy. while 循环中的条件检查它是否为真/假。 When i is equal to 5, the input is 0, which causes the condition to be false.当 i 等于 5 时，输入为 0，这会导致条件为假。
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/while https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/while
If you want to see some other crazy Javascript, check out these truthy/falsy examples.如果您想查看其他一些疯狂的 Javascript，请查看这些真/假示例。
http://blog.falafel.com/the-truth-about-false-in-javascript/http://blog.falafel.com/the-truth-about-false-in-javascript/
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