javascript - 如何查看 ""之间的代码

Question

我该如何检查该字符串的内容？我知道重点是不要使用括号，我只是不知道该怎么做？

match("abcdef","@C2D!")

我已经有了这段代码，我想删除用户输入函数并替换它，以便它查看字符串并决定它是否只包含文本字符 a、b、c、d、e、f 以及是否包含是否返回 true 如果不是则返回 false

var userinput = prompt('Input characters:');

var lowercase = userinput.toLowerCase();

var allowedcharacters = ["a", "b", "c", "d", "e", "f"]

function checkWord(sInput, arAllowedWrds) {
    for (var i = 0; i < arAllowedWrds.length; i++) {
        if (sInput.indexOf(arAllowedWrds[i]) == -1) {
            return false;
        }
    }

    return true;
}

if (lowercase == allowedcharacters){
  alert(true);
}
else{
  alert(false);
}

Answer 1

是这个吗:

<script>
function checkWord(sInput, allowedcharacters) {
  var regex = new RegExp("^[" + allowedcharacters + "]*$", "i");
  return regex.test(sInput);
}

//
// user input must be only contains alphabet a to f,
// both upper and lowercase are permitted.
//
var allowedcharacters = "abcdef";
var userinput = prompt("Please Input characters in '" + allowedcharacters + "':");

if(userinput) {
  if (checkWord(userinput, allowedcharacters)){
    alert("'" + userinput + "' contains only characters in '" + allowedcharacters + "'.");
  }
  else{
    alert("'" + userinput + "' contains characters out of '" + allowedcharacters + "'.");
  }
}
else{
  alert("userinput is null.");
}

</script>

它检查用户输入是否限制在[abcdef]范围内。例如，abc、efde、fedca，但不是 ypapa、xmama。