PHP display security bar example based on password length

This article mainly shares with you the PHP function of displaying the security bar according to the password length. The code is simple and easy to understand, very good, and has reference value. Friends who need it can refer to it. I hope it can help everyone.

//根据密码长度显示安全条
          <ul class="clear">
          <li>密　　码：</li>
          <li> <input type="password" id="pwd" name="pwd" class="in" onKeyUp=pwStrength(this.value) onBlur=pw_y("pwd","pwd1")></li>
          <li><em class="red">*</em></li>
          <li class="i2 grey"><table border="0" bordercolor="#cccccc" style=&#39;display:marker&#39;>
          <tr align="center">
            <td id="strength_L" bgcolor="#eeeeee">弱</td>
            <td id="strength_M" bgcolor="#eeeeee">中</td>
            <td id="strength_H" bgcolor="#eeeeee">强</td>
          <td align="left" >
           <label id="pwd1">使用数字，字母，下划线，长度在 6 - 20 个字符之间</label></td>
            </tr>
          </table>         
          </li>
          </ul>
function pwStrength(pwd){
  O_color="#eeeeee";
  L_color="#FF0000";
  M_color="#FF9900";
  H_color="#33CC00";
  if (pwd==null||pwd==&#39;&#39;){
    Lcolor=Mcolor=Hcolor=O_color;
  }else{
    S_level=checkStrong(pwd);
    switch(S_level) {
      case 0:
        Lcolor=Mcolor=Hcolor=O_color;
      case 1:
        Lcolor=L_color;
        Mcolor=Hcolor=O_color;
        break;
      case 2:
        Lcolor=Mcolor=M_color;
        Hcolor=O_color;
        break;
      default:
        Lcolor=Mcolor=Hcolor=H_color;
      }
  }
  document.getElementById("strength_L").style.background=Lcolor;
  document.getElementById("strength_M").style.background=Mcolor;
  document.getElementById("strength_H").style.background=Hcolor;
  return;
}

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