javascript - 在 Swift 中使用 UIWebView.stringByEvaluatingJavaScriptFromString 删除 html 中带有 <noscript> 标签的所有元素

Question

我正在尝试在 Swift 应用程序中解析 html 文件，并且希望删除所有带有 noscript 标记的元素。我试过了，但没用

//webView is a UIWebView with html loaded
webView.stringByEvaluatingJavaScriptFromString("var noscript = document.getElementsByTagName('noscript');var parent = document.getElementsByTagName('div');for (var j in parent) {for(var i in noscript) {parent.removeChild(noscript[i]);}}")

Answer 1

你可能会尝试更像一个js代码

var noscript = document.getElementsByTagName('noscript');
var index = noscript.length;
while(index--) {
    noscript[index].parentNode.removeChild(noscript[index]);
}

如果我们查看您的 js 代码，我们可以说三件事

var noscript = document.getElementsByTagName('noscript');
var parent = document.getElementsByTagName('div');
for (var j in parent) {
    // 1 - you iterate on parent but don't use the j variable
    for(var i in noscript) {
        // 2 - parent is an htmlcollection, not an htmlNode, it has no removeChild method
        // 3 - i will take for values 0...n but also 'item' and 'length'
        parent.removeChild(noscript[i]);
    }
}