串行或并行调用多个ajax请求

我有3个功能。

load_graphs('national','','container-natl-rates','container-natl-counts')
load_graphs('division','Western','container-west-rates','container-west-counts')
load_graphs('division','Eatern','container-east-rates','container-east-counts')

load_graphs 是一个执行 ajax 调用并创建图表的函数。

目前，此调用是异步完成的，但我想在完成每个单独的调用后执行类似回调的操作。

一种选择是使用回调，如下所示：

function load_graphs(arg1, arg2, arg3, arg4, done) {
    // then do stuff and when that stuff is done
    // call your callback (in this case I named it "done")
    done();
}

然后在你的方法调用中

load_graphs('national','','container-natl-rates','container-natl-counts', function() {
    // first load_graphs() is complete
    load_graphs('division','Western','container-west-rates','container-west-counts', function() {
        // second load_graphs() is complete
        load_graphs('division','Eatern','container-east-rates','container-east-counts', function() {
            // third load_graphs() is complete
        })
    })
})

还有其他更高级的选项，例如使用第三方工具，例如async https://github.com/caolan/async or co https://github.com/tj/co

希望这可以帮助