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我知道有很多話題,但沒有人回答我的問題。 我必須打印字典中最小和最大的窗口屬性。但我得到了錯誤Cannot set property of innerHTML of null at solve
。 這裏是我的html:無法設置屬性innerHTML空(javascript)
<!DOCTYPE html>
<html lang="en">
<head>
<title>Loops Homework</title>
<meta charset="UTF-8">
</head>
<body>
<span>Problem 1</span>
<button onclick="solve()">Print</button>
<div id="answer1">Answer will appear here</div>
<script src="LexicographicallyProp.js" type="text/javascript"></script>
</body>
</html>
而且下面的JavaScript文件:
function solve() {
let smallest = 'zzz',
largest = '',
prop,
div1 = document.getElementById('#answer1');
for (prop in document) {
if (prop < smallest) {
smallest = prop;
}
if (prop > largest) {
largest = prop;
}
}
div1.innerHTML = 'Smallest property in DOCUMENT: ' + smallest + ' ; Largest prop in DOCUMENT: ' + largest;
}
從的document.getElementById( '#ANSWER1')刪除#號; – Gregg