$ .when.done回调不工作

问题描述

以下代码具有错误的语法错误。可能是因为我使用的是'for'或某事。

The following code has a bad syntax error. Probably because I'm using 'for' or something.

$.when(
    for (var i=0; i < 5; i++) {
        $.getScript( "'" + someArr[i].fileName + ".js'");
    }
    $.Deferred(function( deferred ) {
              $( deferred.resolve );
    })
).done(function() {
    alert("done");
});

我试图调用几个脚本，然后当trey都加载我想警报

I'm trying to call couple of scripts and then when trey are all loaded I want to an alert to show.

推荐答案

具有更改的已注释（但未测试）解决方案位于

A commented (but untested) solution with the changes is below

// When takes a promise (or list of promises), not a random string of javascript
$.when((function() {
    // First we need to define a self resolving promise to chain to
    var d = $.Deferred().resolve();

    for ( var i = 0; i < 5; i++ ) {

        // Trap the variable i as n by closing it in a function
        (function(n) {

            // Redefine the promise as chaining to itself
            d = d.then(function() {

                // You can *return* a promise inside a then to insert it into
                // the chain. $.getScript (and all ajax methods) return promises
                return $.getScript( someArr[n].fileName + '.js' );
            });

        // Pass in i (becomes n)
        }(i));
    }

    return d;

// self execute our function, which will return d (a promise) to when
}())).then(function() {

    // Note the use of then for this function. done is called even if the script errors.
    console.log( 'done' );
});

如果您有选择，更简单的只是

If you have the option, something much simpler is just

$.when(
    $.getScript( 'fileName1.js' ),
    $.getScript( 'fileName2.js' ),
    $.getScript( 'fileName3.js' ),
    $.getScript( 'fileName4.js' )
).then(function() {
    alert("done");
});

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