JS判断字符串小括号是否成对合法

function is_leagl_brackets(string) {
  var array = [];
  for (var i = 0; i < string.length; i++) {
    var item = string[i];
    if (item === "(") {
      array.push("(");
    } else if (item === ")") {
      if (array.length === 0) {
        return false;
      } else {
        array.pop();
      }
    } else {
      continue;
    }
  };
  return array.length === 0;
};


console.log("(asd):", is_leagl_brackets("(asd)"));
console.log("asd(asd(adsfsdf(asdf())))):", is_leagl_brackets("asd(asd(adsfsdf(asdf()))))"));