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  .modal-background{
width: 100%;
height: 100%;
background-color: rgba(0,0,0,0.5);
overflow: hidden;
position: fixed;
top: 0;
right: 0;
bottom: 0;
left: 0;
//outline: 0;
z-index: 9;

}

如果不想让蒙版后面滑动 加上js
$(“body,html”).css({“overflow”:”hidden”});
取消不可滑动
$(“body,html”).css({“overflow”:”auto”});

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<script>
  function addNewStyle(newStyle) {
      var styleElement = document.getElementById('styles_js');
      if (!styleElement) {
          styleElement = document.createElement('style');
          styleElement.type = 'text/css';
          styleElement.id = 'styles_js';
          document.getElementsByTagName('head')[0].appendChild(styleElement);
      }
      styleElement.appendChild(document.createTextNode(newStyle));
  }
         addNewStyle('#intercom-container .intercom-messenger-frame>iframe{top:10% !important;}')
      addNewStyle('#intercom-container .intercom-messenger-frame>iframe{position:absolute !important;}')
      addNewStyle('#intercom-container .intercom-app div.intercom-messenger-frame iframe{height:90% !important;}')

</script>

其实很简单 就是找到合适的class 给他赋予样式
ps：一定要写在layout里面 才能全局通用

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var viewTop = document.body.scrollTop,
       viewBottom = viewTop + window.innerHeight;
           $("#intercom-container .intercom-composer textarea").on("focus", function(){
               window.setTimeout(function() {
                 window.scrollTo(0, viewBottom); // 调整value
              },200);
           })
           $("#intercom-container .intercom-composer textarea").on("blur", function(){
               window.setTimeout(function() {
                 window.scrollTo(0, viewTOP); // 调整value
              },200);
           })

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1、支付宝 url type 中的url scheme自定义
在alipaymanager 中调用自定义的url scheme 即可实现跳转

2.微信统一下单接口返回签名错误 如确定参数无误 重新设置商户key(一样的也可以)

3.app跟网站上的微信支付的账户不是一个 都要设置好才能用

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if (@available(iOS 11.0, *)) {
    _webview.scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    _webview.scrollView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0);
    _webview.scrollView.scrollIndicatorInsets = _webview.scrollView.contentInset;
}

也可以解决ipone x底部留白问题

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1.存储
1）使用- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler{方法
2）

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NSHTTPURLResponse *response = (NSHTTPURLResponse *)navigationResponse.response;
           //读取wkwebview中的cookie 方法
           NSArray *cookies =[NSHTTPCookie cookiesWithResponseHeaderFields:[response allHeaderFields] forURL:response.URL];
           for (NSHTTPCookie *cookie in cookies) {
               [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];
           }
           //看看存入到了NSHTTPCookieStorage了没有
           NSHTTPCookieStorage *cookieJar2 = [NSHTTPCookieStorage sharedHTTPCookieStorage];
           for (NSHTTPCookie *cookie in cookieJar2.cookies) {
               NSLog(@"NSHTTPCookieStorage中的cookie%@", cookie);
           }

2.读取

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// 在此处获取返回的cookie
    NSMutableDictionary *cookieDic = [NSMutableDictionary dictionary];
    NSMutableString *cookieValue = [NSMutableString stringWithFormat:@""];
    NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    for (NSHTTPCookie *cookie in [cookieJar cookies]) {
        [cookieDic setObject:cookie.value forKey:cookie.name];
        NSLog(@"传递的cookie%@", cookieDic);
    }
    // cookie重复，先放到字典进行去重，再进行拼接
    for (NSString *key in cookieDic) {
        NSString *appendString = [NSString stringWithFormat:@"%@=%@;", key, [cookieDic valueForKey:key]];
        [cookieValue appendString:appendString];
    }
   NSMutableURLRequest *requestCookie = [NSMutableURLRequest requestWithURL:url];
    [requestCookie addValue:cookieValue forHTTPHeaderField:@"Cookie"];
    NSLog(@"传递的最终cookie%@", requestCookie);

3.清除

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NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];
   NSArray *_tmpArray = [NSArray arrayWithArray:[cookieJar cookies]];
   for (id obj in _tmpArray) {
       [cookieJar deleteCookie:obj];
   }

ps:如果想再次进入免登陆 需要在app端存储一下
app端手动存储Cookie

如果没设置Cookie失效时间expiresDate:(null)，sessionOnly:true,kill掉后系统不会自动保存Cookie，如果想持久化Cookie 模仿浏览器存住Cookie，使用NSUserDefaults存下即可

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//合适的时机保存Cookie
- (void)saveCookies{
    NSData *cookiesData = [NSKeyedArchiver archivedDataWithRootObject: [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies]];
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setObject: cookiesData forKey: @"org.skyfox.cookie"];
    [defaults synchronize];
}

//合适的时机加载Cookie 一般都是app刚刚启动的时候
- (void)loadCookies{
    NSArray *cookies = [NSKeyedUnarchiver unarchiveObjectWithData: [[NSUserDefaults standardUserDefaults] objectForKey: @"org.skyfox.cookie"]];
    NSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    for (NSHTTPCookie *cookie in cookies){
        [cookieStorage setCookie: cookie];
    }
}

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ios9之后才支持
NSURL *url = [NSURL URLWithString:[urlString stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]]];

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NSString 声明的字符串不可变
所以想要改变这个字符串要用NSMutableString来声明

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将will_paginate 写成一个partial 在ajax调用的时候 替换parcial
注意：1.页面上render的外面要套一层div
2.不需要传递参数 will_paginate 会自动去相对应的controller里面找
3.分页直接点击会显示html用一下方法可解决（让will_paginate 可调用ajax方法）

application_helper.rb
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module ApplicationHelper
  def paginate(collection, params= {})
    will_paginate collection, params.merge(:renderer => RemoteLinkPaginationHelper::LinkRenderer)
  end
end
index.html.erb
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<div id="page_links">
    <%= paginate @results %>
</div>
remote_link_pagination_helper.rb
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module RemoteLinkPaginationHelper
  class LinkRenderer < WillPaginate::ActionView::LinkRenderer
    def link(text, target, attributes = {})
      attributes['data-remote'] = true
      super
    end
  end
end

Make will_paginate generate ajax links原文