访问另一个javascript文件/Html文件中的Javascript变量值
[英]Accessing Javascript variable Value in another javascript file / Html file
问题描述
Say I have a js file and a html file:
假设我有一个 js 文件和一个 html 文件：
jScript1.js jScript1.js
var a = 0.05 ;
var var1 = a;
function myFunc1(){
console.log("original"+ a);
a = a*5 ;
console.log("processed a"+ a) ;
var1 = a;
}
index.html索引.html
<body>
<script src="jScript1.js">myFunc1();</script>
<script>
console.log("display"+ a);
</script>
</body>
I am able to access var1 in js file but when I use it, I get the initialization value [in this case 0.05] and not the processed value which is stored in var1 after calling myFunc() in the script tag with js file as script resource我能够访问 js 文件中的 var1，但是当我使用它时，我得到了初始化值 [在这种情况下为 0.05]，而不是在使用 js 文件作为脚本调用脚本标记中的 myFunc() 后存储在 var1 中的处理值资源
How to get the final value of var1 in the html file after the processing that is happening inside myFunc()?在myFunc() 内部进行处理后，如何获取html 文件中var1 的最终值？
1 个解决方案
解决方案1
2 2018-02-06 10:58:10
Relevant excerpts from the specification (I took them from https://dev.w3.org/html5/spec-preview/the-script-element.html in particular):规范中的相关摘录（我特别是从https://dev.w3.org/html5/spec-preview/the-script-element.html 获取的）：
When used to include dynamic scripts, the scripts may either be embedded inline or may be imported from an external file using the src attribute.
[...]
(Step 15.)
[...]
If the element has a src attribute
The element must be added to the set of scripts that will execute as soon as possible of the Document of the script element at the time the prepare a script algorithm started.Otherwise
The user agent must immediately execute the script block, even if other scripts are already executing.
I am not sure how it has gone unnoticed, but that myFunc1();我不确定它是如何被忽视的，但是myFunc1(); call simply does not get executed, and its logs do not appear at all. call 根本不会被执行，它的日志根本不会出现。
If you try如果你试试
<body>
<script src="jScript1.js"></script>
<script>
console.log("display1 " + a);
myFunc1();
console.log("display2 " + a);
</script>
</body>
instead, that will work.相反，这会起作用。
(While the notation 'dynamic script' may seem a bit confusing, the alternative is 'data block') （虽然符号“动态脚本”可能看起来有点混乱，但替代方法是“数据块”）
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