Question

当没有匹配时，我无法打印单个输出语句。目前，如果没有匹配（密码中没有数字），它将多次打印，直到找到匹配为止。

有人可以看看下面我的困境：

var password = "password1";
var i = 0;

function checkPassword(password) {
  if (password === "") {
    console.log("password cannot be empty");
  } else if (password.length < 8) {
    console.log("password should be at least 7 characters");
  } else {
    while (i < password.length) {
      if (password[i] == password.match(/[0-9]/g)) {
        console.log("found: " + password[i]);
      } else {
        console.log("not found");
      }
      i++;
    }
  }
}

Answer 1

var password = "password1";
var i = 0;

function checkPassword(password) {
  if (password === "") {
    console.log("password cannot be empty");
  } else if (password.length < 8) {
    console.log("password should be at least 7 characters");
  } else {
    var found = false;
    while (i < password.length) {
      if (password[i].match(/[0-9]/g)) {
        found = true;
        break;
      }
      i++;
    }
    if(found) {
      console.log("found");
    } else {
      console.log("not found");
    }
  }
}

但是，如果你只是在字符串中寻找一个数字，你最好这样做：

var password = "password1";

function checkPassword(password) {
  if (password === "") {
    console.log("password cannot be empty");
  } else if (password.length < 8) {
    console.log("password should be at least 7 characters");
  } else if(!password.match(/[0-9]{1,}/)) {
    console.log("password should contain at least one number");
  } else {
    console.log("okay");
  }
}

这是一个JSFiddle：https://jsfiddle.net/7btt1axb/

Answer 2

这样的东西？

＆＃13;

var password = "password1";

function checkPassword(password) {
  if (password === "") {
    console.log("password cannot be empty");
  } else if (password.length < 8) {
    console.log("password should be at least 7 characters");
  } else {
    var i = 0, found = false;
    while (i < password.length && !found) {
      if (password[i] == password.match(/[0-9]/g)) found = true;
      else i++;
    }
    if (found) {
      console.log("found: " + password[i]);
    } else console.log("not found");
  }
}
checkPassword(password);

＆＃13;

JavaScript - While循环语句打印多次

2 个答案: