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我是 IIFE Functions 的新手，我很难理解如何实现它，但我确实理解它是什么以及它的目的是什么。问题陈述：

您的客户希望从邮政编码研究中获得邮政编码列表（每个仅列出一次），按从小到大的顺序排列。他希望它“只是运行”（自我调用）。

这是我的旧代码，它可以正常工作并正确显示邮政编码。我将显示我第一个运行的初始代码，但不被认为是自调用的：

window.onload = displayUniqueZipcodes;

function assignment12_3() {
    // code goes in here. 
}

// Logic to display the zipcodes.
function displayUniqueZipcodes(){
    // Declare variables.
    var records, zip;
    var output = document.getElementById('outputDiv');
    var zipcodes=[];
    var outputString = "";   

    // Opens the records.
    records = openZipCodeStudyRecordSet();

    // Loops through records, pushes the unique records into the zipcodes array.
        while(records.readNextRecord()){
            zip = records.getSampleZipCode();
            if (!zipcodes.includes(zip)){
               zipcodes.push(zip); 
            }
        }

    // Sorts the zipcodes.
        zipcodes.sort();

    // outputs the zipcodes.
        for (var v in zipcodes){
            outputString += zipcodes[v] + "</br>";
        }
    output.innerHTML = outputString;   
}

＆这里是我现在不再显示邮政编码的代码以及我尝试利用 IIFE 功能的代码：

function assignment12_3() {
    // Your code goes in here.   
    //Variables
    var records, zip;
    var output = document.getElementById("outputDiv");
    var zipcodes = [];
    var outputString = "";

    //Gets the records...
    records = openZipCodeStudyRecordSet();
    //This will loop through the records and put unique records
    //into an array
    while(records.readNextRecord()){
        zip = records.getSampleZipCode();
        if(!zipcodes.includes(zip)){
            zipcodes.push(zip);
        }
    }

    //Will sort the zipcodes
    zipcodes.sort();

    //outputs the zipcodes.
    for(var z in zipcodes){
        outputString += zipcodes[z] + "</br>";
    }

    outputDiv.innerHTML += outputString;

}();

谢谢你。

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