Javascript 无法识别函数
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/5216631/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Javascript does not recognize function
提问by VJune
I am new to programming in Javascript and this one has clearly 'clean bowled' me :(........
我是 Javascript 编程的新手，这个人显然已经“干净利落地”了我 :(........
The following code snippet highlights some text by searching for and modifying the respective text nodes. Text node searching is done by using a Jquery functionality:
以下代码片段通过搜索和修改相应的文本节点来突出显示一些文本。文本节点搜索是通过使用 Jquery 功能完成的：
window.addEventListener("load", highlightSummarySentences , false);
window.addEventListener("load", highlightSummarySentences , false);
function highlightSummarySentences() {
var docName = thisPage;
var numSentences = getCookie(docName+"Num");
var linkSentenceNum = getCookie(docName + 'LinkingSentence');
for(var i=0; i<numSentences; i++) {
var matchMe = getCookie(docName+i);
try {
if (matchMe && i==(linkSentenceNum)) {
highlightText(matchMe, clickedSentenceColour);
}
else if(matchMe){
highlightText(matchMe, summarySentenceColour);
}
} catch (e) {;
}
}
}
The for loop runs once and highlights the appropriate text after which it exits and the page becomes completely white. The following error is seen in the error console:
for 循环运行一次并突出显示适当的文本，然后退出并且页面变为完全白色。在错误控制台中看到以下错误：
Error: getCookie is not defined
错误：未定义 getCookie
but I guess its not getCookie. The script just refuses to recognize any function or variable after the above event. I have no idea what might be causing the script to behave this way. I am developing in firefox.
但我想它不是 getCookie。在上述事件之后，脚本只是拒绝识别任何函数或变量。我不知道是什么导致脚本以这种方式运行。我正在Firefox中开发。
Please give me a hint! Let me know if I should paste more code of give more information.
请给我一个提示！让我知道是否应该粘贴更多代码以提供更多信息。
Thanks,
谢谢，
采纳答案by Dr.Molle
Your description(page clears after 1st loop) sounds like you use somewhere document.write().
您的描述（第 1 次循环后页面清除）听起来像是您在某处使用document.write()。
Do you? (could be in highlightText())
你？（可以在 highlightText() 中）
If yes: you can't use write() after a document is loaded, write() will overwrite all contents, js too, so all functions defined somewhere doesn't exist anymore.
如果是：在加载文档后不能使用 write()，write() 将覆盖所有内容，js 也是如此，因此在某处定义的所有函数不再存在。
回答by Alex Wayne
getCookie()is not a function provided by the browser. This snippet probably expects a getCookie()function to be declared somewhere in your code. document.cookieis what you would use to get the cookie string from a browser, but you have to parse and split it to find the data you need. This is what a getCookiefunction you write would do for you.
getCookie()不是浏览器提供的功能。此代码段可能需要getCookie()在代码中的某处声明一个函数。 document.cookie是您用来从浏览器获取 cookie 字符串的方法，但您必须对其进行解析和拆分才能找到所需的数据。这就是getCookie您编写的函数将为您做的事情。
回答by disappearedng
If you are tagging jquery, I recommend you to do the following:
如果您要标记 jquery，我建议您执行以下操作：
<script>
$(document).ready(function() {
window.addEventListener("load", highlightSummarySentences , false); });
</script>
回答by murali krish
Add this getCookie() function in your page
在您的页面中添加此 getCookie() 函数
function getCookie(cname) {
var name = cname + "=";
var ca = document.cookie.split(';');
for(var i=0; i<ca.length; i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1);
if(c.indexOf(name) == 0)
return c.substring(name.length,c.length);
}
return "";
}
