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调试try.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<p id="test">我是一个段落</p>
<p id="mess">我是一个段落</p>
<input type="number" id="demo">
<button onclick="myFunction()">执行</button>
<script>
    try {
        var a = document.getELementById('test').innerHTML
        // var a = document.getElementById('test').innerHTML
        debugger
        alert(a)

    }
    catch(err){
        document.write(`</br>${err.message}`)
    }
    finally{
        document.write('</br>不管怎样都执行')
    }
    function myFunction()
    {
        try
        {
            var x=document.getElementById("demo").value;
            if(x=="")    throw "empty";
            if(isNaN(x)) throw "not a number";
            if(x>10)     throw "too high";
            if(x<5)      throw "too low";
        }
        catch(err)
        {
            var y=document.getElementById("mess");
            y.innerHTML="Error: " + err + ".";
        }
    }
</script>
</body>
</html>