blocks|key|1044978|text|您需要使用$.ajax()同步调用它，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1044979|$.ajax({
++url:+myUrl,
++dataType:+'json',
++async:+false,
++data:+myData,
++success:+function(data)+{
++++//stuff
++++//...
++}
});|code-block|syntax|javascript|1044980|这将与当前使用的$.getJSON()匹配，如下所示：|1044981|$.getJSON(myUrl,+myData,+function(data)+{+
++//stuff
++//...
});|1044982|entityMap|0|LINK|mutability|MUTABLE|url|http://api.jquery.com/jQuery.ajax/|1|http://api.jquery.com/jQuery.getJSON/^0|5|8|5|8|0|0|0|8|B|8|B|1|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]]|E|$]]|$1|F|3|G|5|H|7|14|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|15|8|@$9|16|A|17|B|C]]|D|@$9|18|A|19|1|1A]]|E|$]]|$1|M|3|N|5|H|7|1B|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]|W|$5|R|S|T|E|$U|X]]]]

You need to make the call using <a href="http://api.jquery.com/jQuery.ajax/" rel="noreferrer"><code>$.ajax()</code></a> to it synchronously, like this:

<pre><code>$.ajax({
 url: myUrl,
 dataType: 'json',
 async: false,
 data: myData,
 success: function(data) {
 //stuff
 //...
 }
});
</code></pre>

This would match currently using <a href="http://api.jquery.com/jQuery.getJSON/" rel="noreferrer"><code>$.getJSON()</code></a> like this:

<pre><code>$.getJSON(myUrl, myData, function(data) { 
 //stuff
 //...
});
</code></pre>

blocks|key|1259890|text|这两个答案都是错误的。你可以的。你需要打电话给|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1259891|$.ajaxSetup({
async:+false
});|code-block|syntax|javascript|1259892|在您的json+ajax调用之前。您可以在调用返回后将其设置为true+(如果页面上有ajax的其他用法，如果您希望它们是异步的)|1259893|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Both answers are wrong.
You can. You need to call 



<pre class="lang-js prettyprint-override"><code>$.ajaxSetup({
async: false
});
</code></pre>

before your json ajax call. And you can set it to true after call retuns ( if there are other usages of ajax on page if you want them async )

blocks|key|1260656|text|我想你们都是对的。后一个答案很好用，但它就像设置了一个全局选项，所以您必须执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1260657|++++$.ajaxSetup({
++++++++async:+false
++++});

++++//ajax+call+here

++++$.ajaxSetup({
++++++++async:+true
++++});|code-block|syntax|javascript|1260658|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I think you both are right. The later answer works fine but its like setting a global option so you have to do the following:

<pre><code> $.ajaxSetup({
 async: false
 });

 //ajax call here

 $.ajaxSetup({
 async: true
 });
</code></pre>

blocks|key|1045792|text|对我来说，Jay+D是对的。我必须在调用之前添加此内容。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1045793|$.ajaxSetup({
++++async:+false
});|code-block|syntax|javascript|1045794|在我之前的代码中，我有这样的代码：|1045795|var+jsonData=+(function()+{
++++var+result;
++++$.ajax({
++++++++type:'GET',
++++++++url:'data.txt',
++++++++dataType:'json',
++++++++async:false,
++++++++success:function(data){
++++++++++++result+=+data;
++++++++}
++++});
++++return+result;
})();
alert(JSON.stringify(jsonData));|1045796|它是有效的find。然后我将更改为|1045797|var+jsonData=+(function()+{
++++var+result;
++++$.getJSON('data.txt',+{},+function(data){
++++++result+=+data;
++++});
++++return+result;
})();
alert(JSON.stringify(jsonData));|1045798|未定义警报。|1045799|如果我添加这三行，警报将再次显示数据。|1045800|$.ajaxSetup({
++++async:+false
});
var+jsonData=+(function()+{
++++var+result;
++++$.getJSON('data.txt',+{},+function(data){
++++++result+=+data;
++++});
++++return+result;
})();
alert(JSON.stringify(jsonData));|1045801|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

In my case, Jay D is right. I have to add this before the call.

<pre><code>$.ajaxSetup({
 async: false
});
</code></pre>

In my previous code, I have this:

<pre><code>var jsonData= (function() {
 var result;
 $.ajax({
 type:'GET',
 url:'data.txt',
 dataType:'json',
 async:false,
 success:function(data){
 result = data;
 }
 });
 return result;
})();
alert(JSON.stringify(jsonData));
</code></pre>

It works find. Then I change to

<pre><code>var jsonData= (function() {
 var result;
 $.getJSON('data.txt', {}, function(data){
 result = data;
 });
 return result;
})();
alert(JSON.stringify(jsonData));
</code></pre>

The alert is undefined.

If I add those three lines, the alert shows the data again.

<pre><code>$.ajaxSetup({
 async: false
});
var jsonData= (function() {
 var result;
 $.getJSON('data.txt', {}, function(data){
 result = data;
 });
 return result;
})();
alert(JSON.stringify(jsonData));
</code></pre>

blocks|key|1260713|text|如果您只需要使用await来避免嵌套代码：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1260714|let+json;
await+new+Promise(done+=>+$.getJSON('https://***',+async+function+(data)+{
++++json+=+data;
++++done();
}));|code-block|syntax|javascript|1260715|entityMap^0|8|5|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

If you just need to <code>await</code> to avoid nesting code:

<pre><code>let json;
await new Promise(done =&gt; $.getJSON('https://***', async function (data) {
 json = data;
 done();
}));
</code></pre>

blocks|key|1044936|text|我不认为您可以在那里设置该选项。您必须使用带有适当参数的jQuery.ajax()+(基本上，getJSON也只是将调用包装到一个更简单的API中)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1044937|entityMap|0|LINK|mutability|MUTABLE|url|http://api.jquery.com/jQuery.ajax/^0|S|D|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I don't think you can set that option there. You will have to use <a href="http://api.jquery.com/jQuery.ajax/" rel="nofollow noreferrer">jQuery.ajax()</a> with the appropriate parameters (basically getJSON just wraps that call into an easier API, as well).

blocks|key|1260678|text|滚动你自己的例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1260679|function+syncJSON(i_url,+callback)+{
++$.ajax({
++++type:+"POST",
++++async:+false,
++++url:+i_url,
++++contentType:+"application/json",
++++dataType:+"json",
++++success:+function+(msg)+{+callback(msg)+},
++++error:+function+(msg)+{+alert('error+:+'+%2B+msg.d);+}
++});
}

syncJSON("/pathToYourResouce",+function+(msg)+{
+++console.log(msg);
})|code-block|syntax|javascript|1260680|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Roll your own e.g.

<pre><code>function syncJSON(i_url, callback) {
 $.ajax({
 type: "POST",
 async: false,
 url: i_url,
 contentType: "application/json",
 dataType: "json",
 success: function (msg) { callback(msg) },
 error: function (msg) { alert('error : ' + msg.d); }
 });
}

syncJSON("/pathToYourResouce", function (msg) {
 console.log(msg);
})
</code></pre>

Is it possible to set <code>async: false</code> when calling <code>$.getJSON()</code> so that the call blocks rather than being asynchronous?

Is it possible to set async:false to $.getJSON call

JSON

是否可以在调用$.getJSON()时设置async: false，以便阻塞调用而不是异步调用？

问是否可以将async:false设置为$.getJSON调用
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回答 7

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问是否可以将async:false设置为$.getJSON调用
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