Question

我目前对如何使代码IIFE自我调用感到困惑。问题陈述是：

您的客户希望从一个邮政编码研究（每个列表仅列出一次）中按从小到大的顺序列出一个邮政编码列表。他希望它“自动运行”（自动调用）。

我的代码显示正确的输出，所有邮政编码从最小到最大都列出一次。我需要帮助来了解如何使当前代码成为“自调用”代码。这是我当前的代码：

//Start.
window.onload = uniqueZipcodes;
function assignment12_3() {
    // Your code goes in here.
}

function uniqueZipcodes(){

    //Start.
    //Variables
    var records, zip;
    var output = document.getElementById("selfInvokingFunctionDiv");
    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;
};

Answer 1

您可以在首次加载时调用一次：

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

assignment12_3();  // invoke it once

或者：

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

当前代码需要为IIFE（自调用）-代码可以运行

1 个答案: