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// 直接 alert
function sayHello () {
  alert('hello')；
}

// alert with parameter
function sayHelloTo(name) {
  alert(`Hello ${name}`)；
}

// alert with parameter & return value
function sayHelloWithRtnValue (name) {
  return `hello ${name}`；
}

let fun1String = "sayHello()"
webview.stringByEvaluatingJavaScript(from: fun1String)

let fun2String = "sayHelloTo('lien')"
webview.stringByEvaluatingJavaScript(from: fun2String)

let fun3Stirng = "sayHelloWithRtnValue('lien')"
let rtnValue = webView.stringByEvaluatingJavaScript(from: fun3Stirng)
print("returned value from JavaScript: \(rtnValue)")