[英]load an external js file before script in body executes (without jQuery)
我有一個網站,該網站應首先加載外部js代碼,然后再在dom中執行代碼,但我無法正常工作。 每當我的外部代碼在body標簽中的js之后加載時,會導致諸如未定義的類和變量之類的問題
的index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Site</title>
<link rel="stylesheet" href="./style.css">
<script src="./project/load.js"></script>
</head>
<body>
<h1>project</h1>
<div id="project"></div>
<script src="./script.js"></script>
</body>
</html>
./project/load.js
window.onload = function() {
var links = ["./project/script1.js", "./project/script2.js", "./project/script3.js"];
for(var link of links) {
var script = document.createElement("script");
script.src = link + "?0";
script.setAttribute("onerror", "reload(this)");
document.head.append(script);
}
}
我也嘗試了'addEventListener('DOMContentLoaded',function(){...});' 但它也確實起作用。
我希望你能幫助我。
編輯1:請求順序
./project/load.js
./script.js
./project/script1.js
./project/script2.js
./project/script3.js
使用defer屬性加載您的JavaScript。 用下面的內容替換HTML。 “ defer”屬性允許僅在頁面加載完成后才運行javascript。 表示DOM可用
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Site</title>
<link rel="stylesheet" href="./style.css">
</head>
<body>
<h1>project</h1>
<div id="project"></div>
<script src="./project/load.js" defer></script>
<script src="./script.js" defer></script>
</body>
</html>
參考資料和進一步閱讀
這是我所做的。 請在下面看這個
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Site</title>
</head>
<body>
<h1>project</h1>
<div id="project"></div>
<script src="load.js" defer></script>
<script src="script.js" defer></script>
</body>
</html>
Javascript-load.js
(function(){
var dom = document.getElementById("project");
if( dom !== null ){
dom.innerHTML = "<p>Iam load.js " + new Date().toString() + "</p>";
console.log("Iam load.js " + new Date().toString());
}
})();
Javascript-script.js
(function(){
var dom = document.getElementById("project");
if( dom !== null ){
dom.innerHTML = dom.innerHTML + "<p>Iam script.js " + new Date().toString() + "</p>";
console.log("Iam script.js " + new Date().toString());
}
})();
產量
您可以看到,我添加腳本的順序是先加載的。
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