console.assert(value[, ...message])
-
value<any> 测试为真的值。¥
value<any> The value tested for being truthy. -
...message<any> 除了value之外的所有参数都用作错误消息。¥
...message<any> All arguments besidesvalueare used as error message.
如果 value 为 非真值 或省略,则 console.assert() 写入消息。它只写入一条消息,不会影响执行。输出始终以 "Assertion failed" 开头。如果提供,则使用 util.format() 格式化 message。
¥console.assert() writes a message if value is falsy or omitted. It only
writes a message and does not otherwise affect execution. The output always
starts with "Assertion failed". If provided, message is formatted using
util.format().
如果 value 是 真值,则什么也不会发生。
¥If value is truthy, nothing happens.
console.assert(true, 'does nothing');
console.assert(false, 'Whoops %s work', 'didn\'t');
// Assertion failed: Whoops didn't work
console.assert();
// Assertion failed