一、UIWebView 中的 方法可以直接加載

stringByEvaluatingJavaScriptFromString:

- (void)webViewDidFinishLoad:(UIWebView *)webView{
[webView stringByEvaluatingJavaScriptFromString:
@"var script = document.createElement('script');"
"script.type = 'text/javascript';"
"script.text = \"function ResizeImages() { "
"var myimg,oldwidth;"
"var maxwidth = 1000.0;" // UIWebView中顯示的圖片寬度
"for(i= 1;i <document.images.length;i++){" // 之所以i= 1，因?yàn)槲业?號(hào)位是頭像，其他都是需要放大的，適應(yīng)屏幕的
"myimg = document.images[i];"
"oldwidth = myimg.width;"
"myimg.width = maxwidth;"
"}"
"}\";"
"document.getElementsByTagName('head')[0].appendChild(script);
ResizeImages();
"];
}

二、WKWebVIew 也就是方法不一樣

[evaluateJavaScript:completionHandler: ]方法，JS部分和上面的一樣。

- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{
       [ webView evaluateJavaScript:@"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '300%'" completionHandler:nil];
    [ webView evaluateJavaScript:@"var script = document.createElement('script');"
     "script.type = 'text/javascript';"
     "script.text = \"function ResizeImages() { "
     "var myimg,oldwidth;"
     "var maxwidth = 1000.0;" // UIWebView中顯示的圖片寬度
     "for(i=1;i <document.images.length;i++){"
     "myimg = document.images[i];"
     "oldwidth = myimg.width;"
     "myimg.width = maxwidth;"
     "}"
     "}\";"
     "document.getElementsByTagName('head')[0].appendChild(script);ResizeImages();" completionHandler:nil];
}