无法从主体 onload 调用函数（未捕获的引用错误：未定义启动）javascript
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Can't call function from body onload (uncaught reference error: start is not defined) javascript
提问by Tae Hagen
I have a body onload calling a function in javascript. I Have tried many things, but the console just prints to the error log: uncaught reference error: start is not defined. I think it might be a malfunction, please notify me if it works for you. My code is as follows:
我有一个主体 onload 在 javascript 中调用一个函数。我尝试了很多东西，但控制台只是打印到错误日志：未捕获的引用错误：未定义启动。我认为这可能是故障，如果对您有用，请通知我。我的代码如下：
<!DOCTYPE html>
<html>
<head>
<title>Monster Invasion</title>
<script type="javascript">
var hur;
var monsters = 10;
var objective = false;
var health = 100;
var damage = 30;
var sheild = false;
var ea = 1;
function start() {
setTimeout(hurt,4000)
}
function hurt() {
var newhelth = health - damage;
health = newhelth;
document.getElementById("healtw").innerHTML = health;
start();
}
function kill() {
if(monsters > 0) {
monsters--;
document.getElementById("monster1").src="dead.jpg"
setTimeout(next,2000)
}else {
objective = true;
document.location="endoflevel.html";
}
}
function next() {
document.getElementById("monster1").src="monster.jpg"
}
}
</script>
</head>
<body onload="start()">
<p id="healtw"></p>
<embed src="guide_first_level.mp3" type="audio/mp3" hidden="true" autostart="true">
<a id="st" onclick="kill()"><img id="monster1" src="monster.jpg"></a>
<p id="ada"></p>
<a href="sheild.html">Activate sheild</a>
</body>
</html>回答by Anik Islam Abhi
your script type is wrong
你的脚本类型错误
try like this
像这样尝试
<script type="text/javascript">
</script>
But you don't need to mention script type
但是你不需要提到脚本类型
just use plain script tag
只需使用普通脚本标签
like this
像这样
<script>
</script>
One more thing to add that before end of script tag you give extra }.
还有一件事要在脚本标记结束之前添加额外的}.
just remove it
删除它
function next() {
document.getElementById("monster1").src="monster.jpg"
}
} // <-- just remove this bracket
</script>
回答by Nancy256
Well for some of you, who are using external js file, please just check to see whether you linked your file or not :)... because I had the same error but as I looked through my code ..I hadn't linked the file then!
那么对于你们中的一些使用外部 js 文件的人来说，请检查你是否链接了你的文件:)...因为我有同样的错误但是当我查看我的代码时..我没有链接然后文件！
just in case you came here looking for an answer too!
以防万一你也来这里寻找答案！
回答by Maxim Gritsenko
There are two problems with your code.
您的代码有两个问题。
javascriptis not a valid type for the script in the browser. Browsers know
text/javascript, but not just javascript, that is why your code is not being executed. Change the type attribute or remove it at all (fortext/javascriptis the default value).You have an extra bracket } at the end of the code. Remove it and your code will work fine.
javascript不是浏览器中脚本的有效类型。浏览器知道
text/javascript，但不仅仅是javascript，这就是为什么您的代码没有被执行。更改 type 属性或完全删除它（fortext/javascript是默认值）。代码末尾有一个额外的括号 }。删除它，您的代码将正常工作。
回答by leo.fcx
There are 3 errors:
有3个错误：
- Correct the
typeof your script tag - There is an extra
}at the end of your code - Instead of using
onload()forbodytag, you should better usewindow.onloadas follows in order to make sure yourstart()function is run once document is ready:
- 更正
type你的脚本标签 }您的代码末尾有一个额外的- 不要使用
onload()forbody标记，您最好使用window.onload如下方法，以确保您的start()函数在文档准备好后运行：
...
<head>
<title>Monster Invasion</title>
<script type="text/javascript">
window.onload = function(){
// Put all your code here
// And at the end run start() function
start();
}
</script>
</head>
<body>
...
