可能重复:
What is the !! (not not) operator in JavaScript?
我遇到过这段代码
function printStackTrace(options) {
options = options || {guess: true};
var ex = options.e || null, guess = !!options.guess;
var p = new printStackTrace.implementation(), result = p.run(ex);
return (guess) ? p.guessAnonymousFunctions(result) : result;
}
不禁要问为什么会有双重否定?有没有其他方法可以达到同样的效果?
(代码来自https://github.com/eriwen/javascript-stacktrace/blob/master/stacktrace.js)
https://stackoverflow.com/questions/10467475
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