javascript-Function.prototype.apply.apply-为什么要两次调用
作者:互联网
今天,在检查Jasmine的源代码here时,我偶然发现了以下内容:
if (queueableFn.timeout) {
timeoutId = Function.prototype.apply.apply(self.timeout.setTimeout, [j$.getGlobal(), [function() {
var error = new Error('Timeout - Async callback was not invoked within timeout specified by jasmine.DEFAULT_TIMEOUT_INTERVAL.');
onException(error);
next();
}, queueableFn.timeout()]]);
}
我对为什么在这里为什么两次调用apply感到很感兴趣.
解决方法:
commit that introduced this syntax解释了一切:
Older IE fixes Still not green, but getting close. Summary of Older
IE discrepancies:
- Older IE doesn’t have apply/call on the timing functions
- Older IE doesn’t allow applying falsy arguments
- Older IE doesn’t allow setting onclick to undefined values
- Older IE doesn’t have text property on dom nodes
标签:jasmine,javascript 来源: https://codeday.me/bug/20191118/2029210.html