javascript UIWebView iOS document.getElementByID 不起作用
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/6913461/
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
UIWebView iOS document.getElementByID does not work
提问by vodkhang
I am having a really weird bug for UIWebView, I load a very simple html into the UIWebView:
我有一个非常奇怪的错误UIWebView，我将一个非常简单的 html 加载到UIWebView：
[self.webview loadHTMLString:@"<html><body><div id='hello'>hello world</div></body></html>" baseURL:nil];
[self.webview loadHTMLString:@"<html><body><div id='hello'>hello world</div></body></html>" baseURL:nil];
and then call 4 lines below:
然后调用下面的 4 行：
NSString *body = [self.webview stringByEvaluatingJavaScriptFromString:
@"document.getElementsByTagName('body')[0].outerHTML"];
NSString *helloValue = [self.webview stringByEvaluatingJavaScriptFromString:
@"document.getElementByID('hello').value"];
NSString *helloOuter = [self.webview stringByEvaluatingJavaScriptFromString:
@"document.getElementByID('hello').outerHTML"];
NSString *helloInner = [self.webview stringByEvaluatingJavaScriptFromString:
@"document.getElementByID('hello').innerHTML"];
NSString *helloElement = [self.webview stringByEvaluatingJavaScriptFromString:
@"document.getElementByID('hello')"];
Only the first line, using getElementsByTagName return me the correct body html, all other lines just return me an empty string @"". What can go wrong with my code? How can I get the divthat has an id of hello
只有第一行，使用 getElementsByTagName 返回正确的正文 html，所有其他行只返回一个空字符串 @""。我的代码会出现什么问题？我怎样才能得到div具有 id 的hello
回答by vodkhang
I figured out the problem: it was my stupid misspelling, getElementByIdinstead of getElementByID
我发现了问题：这是我愚蠢的拼写错误，getElementById而不是getElementByID
