此JavaScript代码有什么问题？ （主体脚本调用head函数）
[英]What's wrong with this javascript code? (body script calling head function)
问题描述
Why does the following not produce any result? 
为什么以下结果没有任何效果？ I get a blank page. 我得到空白页。 I kept modifying/simplifying the code to see where the problem is and it seems to be with the line 我不断修改/简化代码，以查看问题出在哪里，并且似乎与该行有关。
"var count = NbnamePattern(names)"
Things seem to work when the body script calls a function defined in the head but with no arguments passed. 当主体脚本调用在头中定义但未传递任何参数的函数时，事情似乎就起作用了。
<!DOCTYPE html> <html lang="en"> <head> <title>Assignment 2 Q4</title> <meta charset="utf-8" /> <script> function NbnamePattern(var names) { var count = 0; for (var i in names) { if (names[i].search(/ie$/) != -1 || names[i].search(/y$/) != -1) count++; } return count; } </script> </head> <body> <p></p> <script type="text/javaScript"> var names = new Array("freddie", "bob", "mieke", "yahoo2", "georgey"); var count = NbnamePattern(names); document.getElementsByTagName("p")[0].innerHTML = "The number of names having these two patterns (/ie$/) and (/y$) in the array is:" + count; </script> </body> </html>
2 个解决方案
解决方案1
1 已采纳 2017-02-19 05:39:27
function NbnamePattern(var names){
var count = 0;
for(var i in names)
if(names[i].search(/ie$/) != -1 || names[i].search(/y$/) != -1)
count++;
return count;
}
should be 应该
function NbnamePattern(names){
var count = 0;
for(var i in names)
if(names[i].search(/ie$/) != -1 || names[i].search(/y$/) != -1)
count++;
return count;
}
The functions in javascript dont take types, it should just be name javascript中的函数不接受类型，应该只是名称
解决方案2
0 2017-02-19 05:38:42
you need to remove the var from NbnamePattern(var names) function 您需要从NbnamePattern(var names)函数中删除var
<!DOCTYPE html> <html lang="en"> <head> <title>Assignment 2 Q4</title> <meta charset="utf-8" /> <script> function NbnamePattern(names) { var count = 0; for (var i in names) { if (names[i].search(/ie$/) != -1 || names[i].search(/y$/) != -1) count++; } return count; } </script> </head> <body> <p></p> <script type="text/javaScript"> var names = new Array("freddie", "bob", "mieke", "yahoo2", "georgey"); var count = NbnamePattern(names); document.getElementsByTagName("p")[0].innerHTML = "The number of names having these two patterns (/ie$/) and (/y$) in the array is:" + count; </script> </body> </html>
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