// 注入 JS 查找    NSString *resPath = [[NSBundle mainBundle] resourcePath];    static NSString *jsQuery = nil;    static dispatch_once_t onceToken;    dispatch_once(&onceToken, ^{        jsQuery = [NSString stringWithContentsOfFile:[resPath stringByAppendingPathComponent:@"js_plugins.js"] encoding:NSUTF8StringEncoding error:nil];            });    NSString *js = [NSString stringWithFormat:@"var highlightPlugin = document.getElementById(‘js_plugins‘);                     if (highlightPlugin == undefined) {                     document.body.innerHTML += ‘<div id=\"js_plugins\"> \                    <style type=\"text/css\"> \                    .utaHighlight { background-color:yellow; }                     .selectSpan { background-color:yellow; color:red;}                     </style>                     </div>‘; \                    %@                     }", jsQuery];        [self stringByEvaluatingJavaScriptFromString:js];        // 清除上次的高亮并设置当前关键字高亮    [self stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"jQuery(‘body‘).removeHighlight().utaHighlight(‘%@‘);", str]];        // 获取关键字数量    NSString *count = [self stringByEvaluatingJavaScriptFromString:@"jQuery(‘.utaHighlight‘).length"];        if ([count integerValue]>0) {        [self focusToFindIndex:0];    }