javascript 验证阻止某些词

Question

我试图阻止用户在 "and"、"or"、“/”、“\”等文本字段中输入某些单词和特殊字符。如何将变量设置为两个或多个条件，或者我应该如何更好地处理这个问题。

首先，我试图阻止用户输入 "and" 或文本字段。

function watchForWords(text) {
  if (!text) {
  return true;
  }
  var isValid = (text.value != "and" || text.value != "or");
  if (!isValid) {
  text.style.backgroundColor = "#ff8";
  }
return isValid;
}

Answer 1

您有几个选项，具体取决于您要如何定义 "word." 如果您指的是一串文本，您可以使用一些简单的东西，例如 indexOf 检查一个字符串是否包含另一个.如果你的字面意思是单词，在 space 分隔的意义上，你可能需要一个正则表达式。

简单：

var blacklist = ["and", "or", "/", "\"];

function validate(input) {
  for (var i = 0; i < blacklist.length; ++i) {
    if (input.indexOf(blacklist[i]) >= -1) {
      // String is present
      return false;
    }
  }
  // No blacklisted strings are present
  return true;
}

console.log("this is a clean string", validate("this is a clean string")); // true
console.log("and this is a dirty string", validate("and this is a dirty string")); // false
console.log("andthis is also dirty", validate("andthis is also dirty")); // false

正则表达式：

var blacklist = ["and", "or", "/", "\"];

function validate(input) {
  for (var i = 0; i < blacklist.length; ++i) {
    var expr = new RegExp("\b" + blacklist[i] + "\b");

    if (expr.exec(input)) {
      // String is present
      return false;
    }
  }
  // No blacklisted strings are present
  return true;
}

console.log("this is a clean string", validate("this is a clean string")); // true
console.log("and this is a dirty string", validate("and this is a dirty string")); // false
console.log("andthis is also dirty", validate("andthis is also dirty")); // true, note the difference from the previous because of no word sep

Answer 2

var isValid = !/(\w+)?and|or|\/|\\w+/.exec(myString)

如果

isValid 不包含 "and" 或 "or" 或您声明的任何其他字符，则为 true；如果至少包含其中一个，则为 false

javascript 验证阻止某些词

javascript validation prevent certain words

javascript

validation