UIWebView与JavaScript常用交互代码

最近打算换个工作环境，所以就没怎么写东西。面试中，被问到一些在UIWebView和WKWebView中如何与JavaScript交互的问题，索性在这里复习一下，有的都忘了。

CSS常用参数：

是否允许用户选择元素的内容，选择值包括：
1.auto：用户可以元素内的内容
2.none：用户不能选择任何内容
3.text：用户只能选择元素内的文本

常用语句：

1.禁用用户选择
[self.webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.style.webkitUserSelect='none'"];

2.禁用长按弹出框
[self.webView stringByEvaluaingJavaScriptFromString:@"document.documentElement.style.webkitTouchCallout='none'"];

3.获得UIWebView的URL地址
NSString *currentURL = [webView stringByEvaluatingJavaScriptFromString:@"document.location.href"]; NSLog(@"currentURL == %@",currentURL);

4.获得UIWebView的标题
NSString *theTitle = [webView stringByEvaluatingJavaScriptFromString:@"document.title"]; NSLog(@"theTitle ==%@",theTitle);

5.通过name（获得或设置）界面元素的value值
NSString *js_email_ByName = [webView stringByEvaluatingJavaScriptFromString:@"document.getElementByName('email')[0].value='hello';"]; NSLog(@"js_email_ByName==%@",js_email_ByName); NSString *js_password_byName = [webView stringByEvaluatingJavaScriptFromString:@"document.getElementByName('pwd')[0].value='hello';"]; NSString *js_phone_ByName = [webView stringByEvaluatingJavaScriptFromString:@"document.getElementByName('tel')[0].value='hello';"]; NSlog(@"js_phone_ByName==%@",js_phone_ByName);

6.通过id获取与设置与上述类似
只是将@“”中的内容换成document.getElementByIdx_x_x('phone自己替换').value='';

7.提交表单
NSString *js_forms = [webView stringByEvaluatingJavaScriptFromString:@"document.forms[0].submit();"]; NSLog(@"js_forms==%@",js_forms);

8.获得body与body之间的HTML
NSString *allHTML = [webView stringByEvaluatingJavaScriptFromString:@"document.body.innerHTML"]; NSLog(@"allHTML:%@",allHTML);

9.使UIWebView的输入框获得焦点，但是无法弹出iPhone键盘
[webView stringByEvaluatingJavaScriptFromString:@"document.querySelector('#saySome').focus()"]; [webView stringByEvaluatingJavaScript:@"document.getElementByIdx_x("saySome").scrollntoView("true")"];

10.改变webView尺寸时对应改变web page尺寸
[webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"document.querySelector('meta[name=viewport]').setAttribute('content','width=%d;',false);"(int)webView.frame.size.width]];

先罗列这么多，后面再更新