无法在Javascript之前加载HTML [英] Unable to load HTML before Javascript
问题描述
我是Java的新手，并且知道如何在执行javascript之前加载html.
I am new to Javascript, and know how can I load html before javascript is executed.
我确实检查了关于stackoverflow的问题，并尝试实施给出的解决方案，但是没有一个起作用.
I did check the questions on stackoverflow and tried to implement the solutions given but none worked.
以下是我尝试过的各种代码的代码.
Following is the code of various code that I tried.
-
在正文结束之前写脚本标签
Wrote script tag before the body ends
在函数内部编写了javascript代码，并在body的onload内调用了该代码，但是它也不起作用. (还尝试注释documnet.onload = cal();并执行).
wrote the javascript code inside a function and called it inside onload of body but it didn't work either. (Also tried to comment documnet.onload = cal(); and execute).
<!DOCTYPE html>
<html>
<head>
<title>Age Calculator</title>
</head>
<body onload="cal();">
<h1>Age Calculator</h1>
<p>Enter your age and find how many days you have been alive</p>
<script type="text/javascript" src="Age.js"></script>
</body>
</html>
//Javascript code
function cal(){
var age = prompt("How old are you?");
var days = age * 365.25;
alert("You are approx " + days + " days");
}
documnet.onload = cal();
我希望在询问用户之前显示html.
I want the html to be displayed before user is asked How old are you?
推荐答案
问题是prompt和类似的功能，例如Alert 阻止浏览器-它们会阻止呈现，直到弹出框出现已提交或取消.
The problem is that prompt and similar functions like alert block the browser - they prevent rendering until the pop-up box has been submitted or canceled.
<h1>Age Calculator</h1>
<p>Enter your age and find how many days you have been alive</p>
<script>
var age = prompt("How old are you?");
</script>
如果要确保在prompt出现之前显示HTML，可以使用setTimeout，使浏览器有机会在调用prompt之前绘制HTML:
If you want to make sure the HTML displays before the prompt comes up, you might use setTimeout, giving the browser a chance to paint the HTML before the prompt gets called:
<h1>Age Calculator</h1>
<p>Enter your age and find how many days you have been alive</p>
<script>
setTimeout(() => {
var age = prompt("How old are you?");
});
</script>
但是更好的解决方案是使用适当的模式，例如带有submit按钮的输入框，它不会阻止浏览器. (最好尽可能不要使用alert，prompt和confirm)
But an even better solution would be to use a proper modal, such as an input box with a submit button, which won't block the browser. (best to never use alert, prompt, and confirm if at all possible)
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