如何设置超时以加载已关闭的外部javascript文件 [英] How to set a timeout for loading a external javascript file which is down

问题描述

我正在使用javascript来包含从另一台服务器上的php文件提供的某些内容.但是，其他服务有时会变得不稳定，或者加载时间长或根本无法加载.

Im using javascript to include some content served up from a php file on another server. However, this other service can sometimes get flaky and either take a long time to load or will not load at all.

在JS中，有一种方法可以尝试在x秒内获取外部数据，然后失败并停止包含js.

Is there a way in JS to try to get the external data for x number of seconds before failing and stopping to include js.

推荐答案

如果您的意思是

<script src="javascript.php"></script>

然后简短的回答是否"，这就是为什么JSONP在这些情况下没有用的原因.

then the short answer is no which is why JSONP is not useful in these cases.

更长的答案是，您可能可以使用setTimeout并测试您应该在javascript中知道的变量，如果var/function不存在，则会给出错误消息.

The longer answer is that you might be able to use setTimeout and test a variable you KNOW should be in the javascript and give an error if the var/function is not there.

如果愿意

<script>
var start = new Date();
var tId;
function testFunction() {
  var end = new Date();
  if ( (end.getTime()-start.getTime()) > 10000) {
    alert('gave up')
  }
  else if (someFunction) { // someFuntion in the external JS
    someFunction()
  }
  else tId=setTimeout(testFunction,1000)
}
</script>

<script src="javascript.php"></script>

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