Question

此代码用于发送JSON请求并将其存储在变量json下。然后，它意味着根据键的值显示图片（特别是如果关键性别=男性）。没有图片显示，我无法在任何地方找到解决方案，任何人都可以提供帮助吗？

＆＃13;

var i=20
while (i<10)
{var json = new XMLHttpRequest();
json.open('GET', "http://localhost:8081/getPersons?format=json", true);
json.send();
 
json.onreadystatechange = processRequest;
function processRequest(e) {
    if (json.readyState == 4 && json.status == 200) {
        var response = JSON.parse(json.responseText);
        alert(response.ip);
    }
}
var wantedKey = 'gender'; // your key here
var wantedVal = 'male'; // your value here

for(var i = 0; i < json.length; i++){

   if(json[i].hasOwnProperty(gender) && json[i][gender] === male) {
    document.createElement("img");
    img.src = "http://advertdemo.ga/adverts/emotion_neutral/male/young/iphone.jpg";
    img.width = "300px";
    img.height = "300px";

    // This next line will just add it to the <body> tag
    document.body.appendChild(img);
    break;
   }

}}

＆＃13;

Answer 1

您的代码存在很多问题，最重要的是您似乎误解了AJAX的工作原理。这是我的修复，其中包含对错误以及在哪里的评论。

import matplotlib.pyplot as plt
import numpy as np

x = np.arange(0.1,4,0.5)
y1 = np.exp(-x)
y2 = np.exp(-x)*1.2+0.25

plot = plt.figure()
ax = plot.add_axes([0,0,1,1])

ax.plot(x,y1,color="red",label="Y1")
ax.errorbar(x,y2,yerr=0.1,color="blue",marker='*',capsize=4,label="Y2")

leg = ax.legend();

for artist, text in zip(leg.legendHandles, leg.get_texts()):
    col = artist.get_color()
    if isinstance(col, np.ndarray):
        col = col[0]
    text.set_color(col)

plt.show()

Answer 2

试试这个：

var i=20
while (i<10)
{var json = new XMLHttpRequest();
json.open('GET', "http://localhost:8081/getPersons?format=json", true);
json.send();
 
json.onreadystatechange = processRequest;
function processRequest(e) {
    if (json.readyState == 4 && json.status == 200) {
        var response = JSON.parse(json.responseText);
        alert(response.ip);
    }
}
var wantedKey = 'gender'; // your key here
var wantedVal = 'male'; // your value here

for(var j = 0; j < json.length; j++){

   if(json[i].hasOwnProperty(gender) && json[i][gender] === male) {
    img= document.createElement("img");
    img.setAttribute("src", "http://advertdemo.ga/adverts/emotion_neutral/male/young/iphone.jpg");
    img.setAttribute("width", "300");
    img.setAttribute("height", "300");

    // This next line will just add it to the <body> tag
    document.body.appendChild(img);
    break;
   }

}}

JSON请求 - 为什么没有显示图片？

2 个答案: