简单的 JavaScript 字数统计功能
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Simple JavaScript Word Count Function
提问by Val Okafor
I finally started to learn JavaScript and for some reason I can't get this simple function to work. Please tell me what I am doing wrong.
我终于开始学习 JavaScript，但由于某种原因我无法让这个简单的函数工作。请告诉我我做错了什么。
function countWords(str) {
/*Complete the function body below to count
the number of words in str. Assume str has at
least one word, e.g. it is not empty. Do so by
counting the number of spaces and adding 1
to the result*/
var count = 0;
for (int 0 = 1; i <= str.length; i++) {
if (str.charAt(i) == " ") {
count ++;
}
}
return count + 1;
}
console.log(countWords("I am a short sentence"));
I am getting an error SyntaxError: missing ; after for-loop initializer
我收到一个错误 SyntaxError: missing ; after for-loop initializer
Thanks for your assistance
感谢你的协助
回答by Guffa
There is no intkeyword in Javascript, use varto declare a variable. Also, 0can't be a variable, I'm sure that you mean to declare the variable i. Also, you should loop from 0 to length-1 for the characters in a string:
intJavascript 中没有关键字，用于var声明变量。另外，0不能是变量，我确定您的意思是声明变量i。此外，您应该为字符串中的字符从 0 循环到 length-1：
for (var i = 0; i < str.length; i++) {
回答by Sachin
I think you want to write this
我想你想写这个
for (var i = 0; i <= str.length; i++)
instead of this
而不是这个
for (int 0 = 1; i <= str.length; i++)
So the problems are there is nothing like intin javascript and also you are using 0=1that doesn't make any sense. Just use variable iwith varkeyword.
所以问题是int在 javascript 中没有任何东西，而且你正在使用0=1它没有任何意义。只需使用i带var关键字的变量。
回答by Anish Gupta
This
这
for (int 0 = 1; i <= str.length; i++)
should be
应该
for (var i = 1; i <= str.length; i++)
There is no keyword intin javascript
intjavascript中没有关键字
回答by sylwia
This is what you wanted:
这就是你想要的：
function countWords(str) {
var count = 0,
i,
foo = str.length;
for (i = 0; i <= foo;i++;) {
if (str.charAt(i) == " ") {
count ++;
}
}
return console.log(count + 1);
}
countWords("I am a short sentence");
btw. try to avoid declaring variables inside loop, it's faster when outside
顺便提一句。尽量避免在循环内声明变量，在循环外会更快
