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判斷輸入框輸入是否是數位

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&lt;head&gt; &nbsp; &lt;title&gt;測試數位&lt;/title&gt; &nbsp; &lt;script&gt; &nbsp;&nbsp; &nbsp; &nbsp; function onCheck() { &nbsp; &nbsp; &nbsp; var numValue=document.getElementById("num").value; &nbsp; &nbsp; &nbsp; var index=-1; &nbsp; &nbsp; &nbsp; for(var i=0;i&lt;numValue.length;i++){ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; var ch=numValue.charAt(i); &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if(ch&gt;=0&amp;&amp;ch&lt;=9){ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; index=-1; &nbsp; &nbsp; &nbsp; &n bsp; &nbsp; }else{ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; index=1; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; b reak; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; } &nbsp; &nbsp; &nbsp; } &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if(index==1){ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; alert("您輸入的非數位！ 請重新輸入"); &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; document.getElementById("num").value=""; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return; &nbsp; &nbsp; &nbsp; }else{ &nbsp; &nbsp; &nbsp; alert("輸入正確！ 您輸入的數位是："+numValue); &nbsp; } &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; } &nbsp; &nbsp; &nbsp; function onCheck1(){ &nbsp; &nbsp; &nbsp; &n bsp; &nbsp; var numValue=document.getElementById("num1").value; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if(isNaN(numValue)){ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; alert("您輸入的非數位！ 請重新輸入..."); &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; document.getElementById("num1").value=""; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }else{ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; alert("輸入正確！ 您輸入的數位是:"+numValue); &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; } &nbsp; &nbsp; &nbsp; } &nbsp; &lt;/script&gt; &nbsp; &lt;/head&gt; &nbsp; &lt;body&gt ; &nbsp; &lt;h3&gt;測試輸入是否是數位第一種方法&lt;/h3&gt; &nbsp; &lt;input type="text" id="num" /&gt; &nbsp; &lt;input type="button" value="測試1" onclick="onCheck()" /&gt; &nbsp; &lt;h3&gt;測試輸入是否是數位第二種方法&lt;/h3&gt; &nbsp; &lt;input type="text" id="num1 " /&gt; &nbsp; &lt;input type="button" value="測試2" onclick="onCheck1()" /&gt; &nbsp; &lt;/body&gt; &nbsp; &lt;/html&gt; &nbsp;

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