Javascript 向数组添加JSON响应时出错
我正在尝试使用goog.gl api制作一个url缩短器。感谢@Barmar,现在我可以使用以下代码获取我的短URL:Javascript 向数组添加JSON响应时出错,javascript,arrays,json,Javascript,Arrays,Json,我正在尝试使用goog.gl api制作一个url缩短器。感谢@Barmar,现在我可以使用以下代码获取我的短URL: var shortURL; $.ajax({ url: 'https://www.googleapis.com/urlshortener/v1/url?shortUrl=http://goo.gl/fbsS&key=AIzaSyANFw1rVq_vnIzT4vVOwIw3fF1qHXV7Mjw', type: 'POST',
var shortURL;
$.ajax({
url: 'https://www.googleapis.com/urlshortener/v1/url?shortUrl=http://goo.gl/fbsS&key=AIzaSyANFw1rVq_vnIzT4vVOwIw3fF1qHXV7Mjw',
type: 'POST',
contentType: 'application/json; charset=utf-8',
data: '{ longUrl: "' + longURL +'"}',
dataType: 'json',
success: function(response) {
shortURL = response.id;
}
});
但是我想缩短一系列的链接!所以我决定使用循环
我创建了longURL[]和shortURL[],但如果运行此代码,我会在shortURL数组中得到这样的输出:[undefined×10,”http://goo.gl/AxzWLx"];代码>完整代码:
var longURL = [];//there are some urls
var shortURL = [];
for (var k = 0; k < longURL.length; k++) {
$.ajax({
url: 'https://www.googleapis.com/urlshortener/v1/url?shortUrl=http://goo.gl/fbsS&key=AIzaSyANFw1rVq_vnIzT4vVOwIw3fF1qHXV7Mjw',
type: 'POST',
contentType: 'application/json; charset=utf-8',
data: '{ longUrl: "' + longURL[k] +'"}',
dataType: 'json',
success: function(response) {
shortURL[k] = response.id;
}
});
}
var longURL=[]//有一些URL
var shortURL=[];
for(var k=0;k
这是一个典型的JavaScript问题。在success
函数中,对每个AJAX调用使用相同的k
。您需要为每个迭代捕获k
的值
var longURL = [];//there are some urls
var shortURL = [];
for (var k = 0; k < longURL.length; k++) {
$.ajax({
url: 'https://www.googleapis.com/urlshortener/v1/url?shortUrl=http://goo.gl/fbsS&key=AIzaSyANFw1rVq_vnIzT4vVOwIw3fF1qHXV7Mjw',
type: 'POST',
contentType: 'application/json; charset=utf-8',
data: '{ longUrl: "' + longURL[k] +'"}',
dataType: 'json',
context: {key: k}, // the "this" value in the callback
success: function(response) {
shortURL[this.key] = response.id;
}
});
}
var longURL=[]//有一些URL
var shortURL=[];
for(var k=0;k
这是一个典型的JavaScript问题。在success
函数中,对每个AJAX调用使用相同的k
。您需要为每个迭代捕获k
的值
var longURL = [];//there are some urls
var shortURL = [];
for (var k = 0; k < longURL.length; k++) {
$.ajax({
url: 'https://www.googleapis.com/urlshortener/v1/url?shortUrl=http://goo.gl/fbsS&key=AIzaSyANFw1rVq_vnIzT4vVOwIw3fF1qHXV7Mjw',
type: 'POST',
contentType: 'application/json; charset=utf-8',
data: '{ longUrl: "' + longURL[k] +'"}',
dataType: 'json',
context: {key: k}, // the "this" value in the callback
success: function(response) {
shortURL[this.key] = response.id;
}
});
}
var longURL=[]//有一些URL
var shortURL=[];
for(var k=0;k
问题在于所有回调函数共享相同的k值,因为它不是每个函数的闭包变量。您可以使用上下文:
选项将适当的值传递给每个回调
var longURL = [];//there are some urls
var shortURL = [];
for (var k = 0; k < longURL.length; k++) {
$.ajax({
url: 'https://www.googleapis.com/urlshortener/v1/url?shortUrl=http://goo.gl/fbsS&key=AIzaSyANFw1rVq_vnIzT4vVOwIw3fF1qHXV7Mjw',
type: 'POST',
contentType: 'application/json; charset=utf-8',
data: '{ longUrl: "' + longURL[k] +'"}',
dataType: 'json',
context: k,
success: function(response) {
shortURL[this] = response.id;
}
});
}
问题是所有回调函数共享相同的k
,因为它不是每个函数的闭包变量。您可以使用上下文:
选项将适当的值传递给每个回调
var longURL = [];//there are some urls
var shortURL = [];
for (var k = 0; k < longURL.length; k++) {
$.ajax({
url: 'https://www.googleapis.com/urlshortener/v1/url?shortUrl=http://goo.gl/fbsS&key=AIzaSyANFw1rVq_vnIzT4vVOwIw3fF1qHXV7Mjw',
type: 'POST',
contentType: 'application/json; charset=utf-8',
data: '{ longUrl: "' + longURL[k] +'"}',
dataType: 'json',
context: k,
success: function(response) {
shortURL[this] = response.id;
}
});
}
第二种变体对我来说很好,看起来更漂亮,更符合逻辑。第二种变体对我来说很好,看起来更漂亮,更符合逻辑。