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[英]Javascript Uncaught ReferenceError: parameter is not defined
[英]Uncaught ReferenceError: “changing” is not defined (JavaScript)
我試圖做一個函數,當一個
單擊“ Try it”按鈕,並在函數內部運行循環,在該函數中使用循環更改單詞
我是JavaScript新手,但是對編程卻很老。
與C或C ++相比有點令人困惑
<!DOCTYPE html>
<html>
<head>
<style>
#demo {
font-size: 600%;
color: red;
}
</style>
<script>
function changing() {
var my = undefined;
for (count = 1; count < 3; count++) {
if (count == 1) {
my = LIFE;
document.getElementById('demo').innerHTML = my;
} else if (count == 2) {
my = STYLE;
document.getElementById('demo').innerHTML = my;
} else if (count == 3) {
{
break;
}
}
}
</script>
</head>
<body>
<h1>My First Web Page</h1>
<p>My first paragraph.</p>
<div id="demo">AWESOME</div>
<button type="button" onclick="changing()">Try it</button>
</body>
</html>
錯誤部分:
else if (count == 3) {
{
您打開了2個花括號
還利用"LIFE"
,而不是LIFE
和"STYLE"~ instead of
STYLE`
function changing() { var my = undefined; for (count = 1; count < 3; count++) { if (count == 1) { my = "LIFE"; document.getElementById('demo').innerHTML = my; } else if (count == 2) { my = "STYLE"; document.getElementById('demo').innerHTML = my; } else if (count == 3) { break; } } }
<!DOCTYPE html> <html> <head> <style> #demo { font-size: 600%; color: red; } </style> </head> <body> <h1>My First Web Page</h1> <p>My first paragraph.</p> <div id="demo">AWESOME</div> <button type="button" onclick="changing()">Try it</button> </body> </html>
在使用strings
時,請記住有關引號的信息。 否則,它將被視為variable
。 而且由於尚未聲明-函數將引發錯誤。
function changing() { var my; for (count = 1; count < 3; count++) { if (count == 1) { my = 'LIFE'; document.getElementById('demo').innerHTML = my; } else if (count == 2) { my = 'STYLE'; document.getElementById('demo').innerHTML = my; } else if (count == 3) { break; } } }
#demo { font-size: 600%; color: red; }
<h1>My First Web Page</h1> <p>My first paragraph.</p> <div id="demo">AWESOME</div> <button type="button" onclick="changing()">Try it</button>
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