<div class="content"> <div class="title">支付寶支付密碼：</div> <div class="box"></div> <div class="forget">忘記密碼？</div> <div class="point">請輸入6位數字密碼</div> <button class="getPasswordBtn">一鍵獲取密碼</button> <div class="errorPoint">請輸入數字！</div></div>

*{ padding: 0; margin: 0;}.content{ width: 400px; height: 50px; margin: 0 auto; margin-top: 100px;}.title{ font-family: '微軟雅黑'; font-size: 16px;}.box{ width: 190px; height: 30px; border:1px solid #ccc; margin-top: 10px; line-height: 30px;}.content .box,.forget{ display: inline-block;}.content .forget{ width: 100px; color:lightskyblue; vertical-align: super; font-size: 14px;}.box input.paw{ width: 30px; height: 20px; line-height: 20px; margin-left: -9px; border:none; border-right: 1px dashed #ccc; text-align: center;}.box input.paw:nth-child(1){ margin-left: 0;}.content .box .pawDiv:nth-child(6) input.paw{ border: none;}.content .box input.paw:focus{outline:0;}.content .box .pawDiv{ display: inline-block; line-height: 30px; width: 31px; height: 31px; margin-top: -2px; float: left;}.point{ font-size: 14px; color: #ccc; margin: 5px 0;}.errorPoint{ color: red; display: none;}.getPasswordBtn{ width: 100px; height: 30px; background-color: cornflowerblue; font-size: 14px; font-family: '微軟雅黑'; color: white; border: none;}

/*動態生成*/var box=document.getElementsByClassName("box")[0];function createDIV(num){ for(var i=0;i<num;i++){  var pawDiv=document.createElement("div");  pawDiv.className="pawDiv";  box.appendChild(pawDiv);  var paw=document.createElement("input");  paw.type="password";  paw.className="paw";  paw.maxLength="1";  paw.readOnly="readonly";  pawDiv.appendChild(paw); }}createDIV(6);var pawDiv=document.getElementsByClassName("pawDiv");var paw=document.getElementsByClassName("paw");var pawDivCount=pawDiv.length;/*設置第一個輸入框默認選中*/pawDiv[0].setAttribute("style","border: 2px solid deepskyblue;");paw[0].readOnly=false;paw[0].focus();var errorPoint=document.getElementsByClassName("errorPoint")[0];/*綁定pawDiv點擊事件*/function func(){ for(var i=0;i<pawDivCount;i++){  pawDiv[i].addEventListener("click",function(){   pawDivClick(this);  });  paw[i].onkeyup=function(event){   console.log(event.keyCode);   if(event.keyCode>=48&&event.keyCode<=57){    /*輸入0-9*/    changeDiv();    errorPoint.style.display="none";   }else if(event.keyCode=="8") {    /*退格回刪事件*/    firstDiv();   }else if(event.keyCode=="13"){    /*回車事件*/    getPassword();   }else{    /*輸入非0-9*/    errorPoint.style.display="block";    this.value="";   }  }; }}func();/*定義pawDiv點擊事件*/var pawDivClick=function(e){ for(var i=0;i<pawDivCount;i++){  pawDiv[i].setAttribute("style","border:none"); } e.setAttribute("style","border: 2px solid deepskyblue;");};/*定義自動選中下一個輸入框事件*/var changeDiv=function(){ for(var i=0;i<pawDivCount;i++){  if(paw[i].value.length=="1"){   /*處理當前輸入框*/   paw[i].blur();   /*處理上一個輸入框*/   paw[i+1].focus();   paw[i+1].readOnly=false;   pawDivClick(pawDiv[i+1]);  } }};/*回刪時選中上一個輸入框事件*/var firstDiv=function(){ for(var i=0;i<pawDivCount;i++){  console.log(i);  if(paw[i].value.length=="0"){   /*處理當前輸入框*/   console.log(i);   paw[i].blur();   /*處理上一個輸入框*/   paw[i-1].focus();   paw[i-1].readOnly=false;   paw[i-1].value="";   pawDivClick(pawDiv[i-1]);   break;  } }};/*獲取輸入密碼*/var getPassword=function(){ var n=""; for(var i=0;i<pawDivCount;i++){  n+=paw[i].value; } alert(n);};var getPasswordBtn=document.getElementsByClassName("getPasswordBtn")[0];getPasswordBtn.addEventListener("click",getPassword);/*鍵盤事件*/document.onkeyup=function(event){ if(event.keyCode=="13") {  /*回車事件*/  getPassword(); }};