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 besidesvalue
are 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