创建WKWebView
lazy var webView: WKWebView = {
// 创建WKPreferences
let preferences = WKPreferences()
// 开启js
preferences.javaScriptEnabled = true
// 创建WKWebViewConfiguration
let configuration = WKWebViewConfiguration()
// 设置WKWebViewConfiguration的WKPreferences
configuration.preferences = preferences
// 创建WKUserContentControlle...