我只是在看JavaScript 计时事件 http://www.w3schools.com/js/js_timing.asp，那里说“第二个参数表示从现在开始多少毫秒后您要执行第一个参数。"
现在，我知道在 JavaScript 中，浮点数和整数都是类型Number，因此从语法上讲，我可以输入浮点值，例如'setTimeout("javascript statement",4.5);' - 然而，JavaScript 是否会尝试在那里创建 4.5 毫秒的延迟？或者它会自动截断为整数并继续？
预先感谢您的任何答复，
Cheers!
This is almost certainly browser-dependent (I haven't checked it's not part of the language spec http://www.ecma-international.org/publications/standards/Ecma-262.htm), but typically this value is stored in a 32-bit signed int, so would only accept integer values between 0 and 2^31 - 1.
Related:
- 为什么 setTimeout() 对于大毫秒延迟值会“中断”？ https://stackoverflow.com/questions/3468607/why-does-settimeout-break-for-large-millisecond-delay-values
- 7.3 计时器 — HTML 标准 http://www.whatwg.org/specs/web-apps/current-work/multipage/timers.html#timers
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