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假值是在 Boolean 上下文中认定可转换为false的值.
JavaScript 在需要用到布尔类型值的上下文中使用强制类型转换（Type Conversion ）将值转换为布尔值，比如：在条件语句或者循环语句中
例子
JavaScript中falsy值的例子 (将falsy值转换为false):
if (false)
if (null)
if (undefined)
if (0)
if (NaN)
if ('')
if ("")
[1] document.all has been used for browser detection in the past and the HTML specification defines a willful violation of the ECMAScript standard here to keep compatibility with legacy code (if (document.all) { // Internet Explorer code here } or using document.all without checking its presence first: document.all.foo).
Sometimes written falsey, although in English usually turning a word into an adjective with a -y, any final e is dropped (noise => noisy, ice => icy, shine => shiny)