Question

我正在尝试将对象（JSON数组）发送到函数中的xmlHttprequest。如果我在body函数内部对getToteMatrix变量进行了硬编码，则它可以工作。但是，当我尝试从函数外部将body变量传递给函数时，出现500错误。

在函数内部声明body变量：）
调用该函数并将body变量传递给该函数。：（
将body变量直接传递给函数：（

getToteMatrix(body);

var body = '{"Action":"<must be non blank>", "SubAction":"", "Cart":"", "CartPositions":1,"OverallTC":false, "ErrorMessage":"","UserResponse1":"","UserResponse2":"","UserResponse3":"","DisplayData":[{"Part":"", "PartDesc1":"", "PartDesc2":"", "UserField":"", "Location":"", "DirectionalDisplay":"", "TotalPickQty":"5", "StartingAisle":"","FullTote":"", "FullToteQty":"", "NewToteQty":""}    ],"BatchData":[{"RemainingPickLines":0, "RemainingLocs":0, "CurrentPicksPerHourRate":0.000}],"AlphaPos":[{"Pos": 1, "PrimaryModule":1, "SecondaryModule":3, "Message":"1111", "Color": 1, "BlinkSpeed": 0, "Buzzer": true, "Enable":true},{"Pos": 2, "PrimaryModule":2, "SecondaryModule":4, "Message":"2222", "Color": 1, "BlinkSpeed": 0, "Buzzer": false, "Enable":true}],"BatchPos": [{"Pos": 15, "PrimaryModule":1, "SecondaryModule":51, "Display":"*15*", "TC":false, "Color":1, "BlinkSpeed":0, "Enable":true, "Visible":true}, {"Pos": 2, "PrimaryModule":2, "SecondaryModule":52, "Display":"2222", "TC":false, "Color":1, "BlinkSpeed":0, "Enable":true, "Visible":true}, {"Pos": 5, "PrimaryModule":5, "SecondaryModule":55, "Display":"FIVE", "TC":false, "Color":1, "BlinkSpeed":0, "Enable":true, "Visible":true},{"Pos": 3, "PrimaryModule":3, "SecondaryModule":53, "Display":"3333", "TC":false, "Color":1, "BlinkSpeed":0, "Enable":true, "Visible":false},{"Pos": 4, "PrimaryModule":4, "SecondaryModule":54, "Display":"4444", "TC":false, "Color":1, "BlinkSpeed":0, "Enable":true, "Visible":true}]}';

function getToteMatrix(body) {
    // when the body variable is declared here the xml request works just fine.           
    // var body = (above json)

    var xmlhttp = new XMLHttpRequest();
    var url = "http://promat.dovetree.com/cart/cart/batchpos";

    xmlhttp.onreadystatechange = function () {
        if (this.readyState === 4 && this.status === 200) {
            document.getElementById("id01").innerHTML = this.responseText;
        }
    };
    xmlhttp.open("POST", url, true);
    xmlhttp.send(body);
}

该函数应采用从服务器推送的HTML格式的数据和输出。在函数外声明的变量出现500错误。

Answer 1

我认为您会收到500错误，因为调用getToteMatrix()作为参数body的{{1}}的时间是 undefined 。

由于起重，JavaScript编译器读取了这样的变量：

body

函数声明在变量声明之前。

检查以下示例：

第一次调用getToteMatrix // function reference anotherBody body时，getToteMatrix(body)未定义。
第二次调用body时，我们在调用之前声明了getToteMatrix(anotherBody)，因此它将在控制台中打印出来。

anotherBody

Answer 2

function getToteMatrix(body) {
    console.log(body);
}
// first call
var body = 'text';
getToteMatrix(body);

// second call
var anotherBody = 'anotherBody';
getToteMatrix(anotherBody);

在这里您需要这样调用您需要先编写一个函数，然后调用一个Function，否则您将无法获得正确的答案。

将对象传递为参数

2 个答案: