[iOS] WKWebView 于JavaScript传值

如果在项目中采用WKWebView的方法加载网页,OC向JS传值方法总结：
1、OC->JS 传数组的方法：
NSString *arrStr = [self.arr componentsJoinedByString:@","];
NSString *js = [NSString stringWithFormat:@"text('%ld',[%@]);",index,arrStr];
[self.wkView evaluateJavaScript:js
                  completionHandler:^(id _Nullable parm1, NSError * _Nullable error) {
                      NSLog(@"%@",[error description]);
}];

2、OC->JS 传字典的方法：
 NSString *jscript = [NSString stringWithFormat:@"post('%@',{%@});", self.URLString, self.postData];
    // 调用JS代码
[self.wkWebView evaluateJavaScript:jscript completionHandler:^(id object, NSError * _Nullable error) {
}];
postData请求块 注意格式：@"\"username\":\"xxxx\",\"password\":\"xxxx\""