04 2019 档案

Symbol Coercion
摘要：explicit coercion of a symbol to a string is allowed, but implicit coercion of the same is disallowed and throws an error. symbol values cannot coerce 阅读全文
posted @ 2019-04-24 01:04 zllmh 阅读(94) 评论(0) 推荐(0)
Operators || and &&
摘要：Both || and && operators perform a boolean test on the first operand (a or c). If the operand is not already boolean (as it's not, here), a normal ToB 阅读全文
posted @ 2019-04-24 01:03 zllmh 阅读(131) 评论(0) 推荐(0)
ToNumber
摘要：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
posted @ 2019-04-23 23:22 zllmh 阅读(297) 评论(0) 推荐(0)
Implicitly: Strings <--> Numbers
摘要：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
posted @ 2019-04-23 23:15 zllmh 阅读(121) 评论(0) 推荐(0)
Coercion
摘要：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
posted @ 2019-04-23 10:35 zllmh 阅读(310) 评论(0) 推荐(0)
JSON Stringification
摘要：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
posted @ 2019-04-23 10:03 zllmh 阅读(166) 评论(0) 推荐(0)
无题
摘要：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
posted @ 2019-04-23 02:02 zllmh 阅读(109) 评论(0) 推荐(0)