在元素列表[object Object]之后的SyntaxError：missing] [英] SyntaxError: missing ] after element list [object Object]

问题描述

我在firebug中遇到了这个错误：

I got this error in firebug :

     SyntaxError: missing ] after element list

    [object Object]

以下javascript代码：

for the following javascript piece of code :

for ( var i = 0; i < 4; i++ ) {
    setTimeout( function(){
        closeBtn( i,'.lt400' );
        // the error exactly happened in next line:
        setTimeout($('#uploaded-holder').hide(), i * 300 );
    }, i * 300 ); 
}

我不知道如何在那里失踪...方式，在Chrome中我收到此错误：

I don't know how a ] can be missing there.. by the way, in chrome i got this error :

Uncaught SyntaxError: Unexpected identifier

推荐答案

setTimeout 需要一个函数或一串代码作为第一个参数。您正在传递此表达式的评估结果：

setTimeout expects a function or a string of code as the first parameter. You are passing the result of the evaluation of this expression:

$('#uploaded-holder').hide()

此表达式既不返回字符串，也不返回函数。它返回一个jQuery集合。

This expression returns neither a string, nor a function. It returns a jQuery collection.

你想：

setTimeout(function () {
    $('#uploaded-holder').hide();
}, i * 300 );

但是，由于setTimeouts和循环的组合，你有一组奇怪的代码。一旦这个错误得到解决，我预计会有一些奇怪的怪异。例如， i 不会出现在执行许多内部函数时的预期...

You have an odd set of code there, though, given the combination of setTimeouts and the loop. I would expect some wild oddities to come from it once this error is resolved. For example, i is not going to be what you expect in the execution of many of those internal functions...

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