Javascript 如何定义全局数组？
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How to define Global Arrays?
提问by Control Freak
Code example:
代码示例：
<script>
var data = new Array();
data[0] = 'hi';
data[1] = 'bye';
</script>
<script>
alert(data[0]);
</script>
This gives the following error: data is not defined
这给出了以下错误： data is not defined
How do you make something like this work? Especially if the first <script>block is being loaded on the page by ajax, and the second block is working from it. jQuery solution is acceptable.
你怎么做这样的工作？特别是如果第一个<script>块被 ajax 加载到页面上，而第二个块正在从它工作。jQuery 解决方案是可以接受的。
回答by xandercoded
Newis not a keyword.
New不是关键字。
Use:
用：
var data = new Array();
Or, more succinctly:
或者，更简洁地说：
var data = [];
After your edit you mention that the first script block is loaded asynchronously. Your code will not work as written. datais a global variable, once it is loaded onto the page. You need to use a callback pattern to properly execute the code.
编辑后，您提到第一个脚本块是异步加载的。您的代码将无法正常工作。data是一个全局变量，一旦它被加载到页面上。您需要使用回调模式来正确执行代码。
Since you haven't posted the asynchronous code I am not going to provide a callbacksample. Though, a quick solution follows:
由于您尚未发布异步代码，因此我不打算提供callback示例。不过，一个快速的解决方案如下：
var interval = setInterval(function(){
if(data) {
/* ... use data ... */
clearInterval(interval);
}
}, 500);
回答by Kristian
To create a global variable, just omit 'var' from the statement. When you omit 'var', you're actually creating the variable in the window namespace.
要创建全局变量，只需从语句中省略 'var'。当您省略“var”时，您实际上是在窗口命名空间中创建变量。
So, zz = 1is actually window.zz = 1
所以，zz = 1实际上是window.zz = 1
If you really wanted to, you could explicitly say
如果你真的想，你可以明确地说
window.data = new Array(); //remember that new should be lowercase.
But you can write that faster anyway by saying
但是你可以通过说更快地写
data = ['hi','bye'];
alert(data);
回答by Scott Sauyet
If you're using jQuery, perhaps you should try .getScript()rather than using .html();
如果您正在使用 jQuery，也许您应该尝试.getScript()而不是使用.html();
// in separate file
data[0] = 'hi';
data[1] = 'bye';
// in main file
var data = [];
$.getScript(url).done(function() {
alert(data[0]);
}).fail(function() {
// handle error
});
