[英]Why does this simple .html file with javascript not work?
此代碼應該起作用。 為什么不呢?
<!DOCTYPE html>
<body>
<h1> The "^" operator in Javascript </h1>
<p id = "foo"></p>
<script>
function f(){
//vars
var a = 5;
var b = 13;
var c = a ^ b;
var binA = a.toString(2);
var binB = b.toString(2);
var binC = c.toString(2);
var strA = a.toString();
var strB = b.toString();
var strC = c.toString();
//make output string
var lineA = "a = " + strA + " = " binA + ", ";
var lineB = "b = " + strB + " = " binB + ", ";
var lineC = "c = " + strC + " = " binC + ", ";
var outputStr = lineA + lineB + lineC;
//output
document.getElementById("foo").innerHTML = outputStr;
}
f();
// For some reason this shows the contents of the header only
</script>
</body>
我對a,b和c進行了toString()轉換,因為我不明白為什么輸出無法在Google Chrome中顯示。 我認識到它們沒有必要。 但是我想使代碼盡可能的簡潔。 我將字符串串聯為子字符串,因為在此代碼的上一迭代中,注釋掉字符串串聯的'C'部分可以顯示輸出字符串的'A'和'B'相關部分。 另外,它使視覺格式保持規則,這是我嘗試用於錯誤檢查的格式。
更新了代碼,您錯過了“ +”號
var lineA = "a = " + strA + " = " + binA + ", ";
var lineB = "b = " + strB + " = " + binB + ", ";
var lineC = "c = " + strC + " = " + binC + ", ";
var outputStr = lineA + lineB + lineC;
語法錯誤,您在binA,binB和binC之前錯過了'+'
var lineA = "a = " + strA + " = " + binA + ", ";
var lineB = "b = " + strB + " = " + binB + ", ";
var lineC = "c = " + strC + " = " + binC + ", ";
var outputStr = lineA + lineB + lineC;
當我修復ff和chrome中的錯誤時,輸出如下所示
a = 5 = 101, b = 13 = 1101, c = 8 = 1000,
這是因為您在第24、25和26行的binA
, binB
和binC
之前缺少+
:)您有一些無效的javascript,並且在控制台中引發了錯誤。
您在javascript中出現語法錯誤。 將輸出字符串塊替換為
//make output string
var lineA = "a = " + strA + " = "+ binA + ", ";
var lineB = "b = " + strB + " = "+ binB + ", ";
var lineC = "c = " + strC + " = "+ binC + ", ";
var outputStr = lineA + lineB + lineC;
它將為您工作。 謝謝
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