Question

所以，我做了大量研究，大多数例子我都看过：

解释为何可以返回null

或

该值应为数字，需要从字符串转换为数字

我的代码发生了什么，该值意味着是一个字符串，并且可以通过查看具有有效字符串条目的表单来进行可视化验证。代码返回值2，没有抛出错误。试图通过Chrome的控制台找到变量的值返回undefined。但是，在同一个表单上，函数会根据发送到PHP处理文件的内容生成一个正确传递的唯一ID。

这是html代码段：

<input type="text" id="billing-email">

此字段包含有效的电子邮件条目，即this@that.com

用于捕获信息的javascript文件如下所示：

$(document).ready(function() {
function getemail(){document.getElementById("billing-email").value;}

function s4() {
    return Math.floor((1 + Math.random()) * 0x10000)
        .toString(16)
        .substring(1);
}
function guid() {
    return s4() + s4() + '-' + s4() + '-' + s4() + '-' +
        s4() + '-' + s4() + s4() + s4();
}
var email = window.setInterval(getemail,100);

var uuid = guid();

function submitform(){
    $.ajax({
        type: "POST",
            url: 'https://app.batteryjunction.com/cr/previous-builds/jstorage-test/controller/process.php',
            dataType: 'json',
            data: {
                myform:[{
                    uuid: uuid,
                    email: email,
                }]
            },
            async: false,
        });
    }
window.setInterval(submitform,3000);
});

发送到PHP处理文件的标题如下所示：

Request URL: https://some.com/some/app.php
Request Method: POST
Status Code: 200 OK
Form Data
myform[0][uuid]: ghjkdkgh-f456-75fd-5gsr-jgdk8vhd
myform[0][email: 2

问题是，为什么发送2而不是电子邮件地址？

Answer 1

正如评论中j08691指出的那样，您正在存储setInterval ID（显然是2）。以下是更好的方法：

$(document).ready(function () {
    function getemail() {
        // this function doesn't return anything, so "var email = getemail();" means "var email" would be undefined
        document.getElementById("billing-email").value;
    }

    function s4() {
        return Math.floor((1 + Math.random()) * 0x10000)
            .toString(16)
            .substring(1);
    }

    function guid() {
        return s4() + s4() + '-' + s4() + '-' + s4() + '-' +
            s4() + '-' + s4() + s4() + s4();
    }
    // window.setInterval returns an integer value representing the interval
    // so you can use clearInterval to stop the interval
    // correct use of "email" below would be: window.clearInterval(email);
    //var email = window.setInterval(getemail, 100);

    //var uuid = guid();

    function submitform() {
        var email = document.getElementById("billing-email").value,
            uuid = guid();
        $.ajax({
            "type": "POST",
            "url": "https://app.batteryjunction.com/cr/previous-builds/jstorage-test/controller/process.php",
            "dataType": "json",
            "data": {
                "myform": [{
                    "uuid": uuid,
                    "email": email //remove the last comma, or IE will throw a hissy-fit
                }]
            },
            "async": false,
        });
    }
    window.setInterval(submitform, 3000);
});

getElementById似乎是返回数字而不是值

1 个答案: