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true becomes 1 and false becomes 0. undefined becomes NaN, but (curiously) null becomes 0 Objects (and arrays) will first be converted to their primit 阅读全文
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According to ES5 spec section 11.6.1, the + algorithm (when an object value is an operand) will concatenate if either operand is either already a stri 阅读全文
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ToBoolean Falsy Values All of JavaScript's values can be divided into two categories: 1. values that will become false if coerced to boolean 2. everyt 阅读全文
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The JSON.stringify(..) utility will automatically omit undefined, function, and symbol values when it comes across them. If such a value is found in a 阅读全文
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Rather than running away from what you don't fully understand because everyone else does, or because you get bitten by some quirk, I think you should 阅读全文