在脚本之间的嵌套函数中传递变量
[英]Passing variables in nested functions between scripts
问题描述
I am a newbie to jQuery and am trying to make a variable within a nested function available between scripts. 
我是jQuery的新手，正在尝试在脚本之间的嵌套函数中创建变量。 However, I am unsure of how to do so (I am pretty bad at understanding scope). 但是，我不确定该怎么做（我很不了解范围）。 Here is the code (note: I copy-pasted this from jsFiddle, hence some tags are purposefully missing). 这是代码（请注意：我从jsFiddle复制粘贴了此代码，因此故意丢失了一些标签）。
<body>
<h1>Hello</h1>
<button id="btn">click</button>
<script>
var x;
$(document).ready(function() {
$(document).on("click", "#btn", function() {
x = "hello world";
});
});
</script>
<script>
alert(x);
</script>
</body>
Any help is appreciated! 任何帮助表示赞赏！
2 个解决方案
解决方案1
1 2013-09-05 15:54:56
for that alert to alert Hello World you need to add it inside the click function... since x is redeclare inside the click event . 对于提醒Hello World警报，您需要将其添加到click函数中...因为x在click事件中被重新声明。 and you don't have to seperate your <script> . 而且您不必分隔<script> 。
<script>
var x;
$(document).ready(function() {
$(document).on("click", "#btn", function() {
x = "hello world";
alert(x); //alerts hello world
});
alert(x); //alerts undefined since x is not set as this is executed before the click event as soon as document is ready
});
alert(x); //alerts undefined since x is not set
</script>
解决方案2
1 2013-09-05 15:57:21
You are doing correctly, in your code <script> alert(x);</script> when you are using alert x value is not set. 您正在正确执行操作，未使用警报x未在代码<script> alert(x);</script>设置。
HTML: HTML：
<button id="set">set</button>
<button id="get">get</button>
JS: JS：
var x;
$(document).ready(function () {
$(document).on("click", "#set", function () {
x = "hello world";
});
$(document).on("click", "#get", function () {
alert(x);
});
});
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