function?count(){
????var?one?=parseInt(document.getElementById("txt1").value)//獲取第一個輸入框的值
????var?two=parseInt(document.getElementById("txt2").value)????//獲取第二個輸入框的值
????var?three?=?document.getElementById("select").value;????//獲取選擇框的值
????var?four=?"";
????switch(three)?{
????????case?'+':
????????????four?=one+two?
????????????break;
????????case?'-':
????????????four=one-two
????????????break;
????????case?'*':
????????????four=one*two?
????????????break;
????????case?'/'
????????????four?=one/two
????????default
????????undefined//獲取通過下拉框來選擇的值來改變加減乘除的運算法則
????}
???document.getElementById("fruit").value?=?four;//設置結果輸入框的值?
????
???}??????
???}
??</script>?
?</head>?
?<body>
???<input?type='text'?id='txt1'?/>?
???<select?id='select'>
<option?value='+'>+</option>
<option?value="-">-</option>
<option?value="*">*</option>
<option?value="/">/</option>
???</select>
???<input?type='text'?id='txt2'?/>?
???<input?type='button'?value='?=?'?onclick="count()"/>?<!--通過?=?按鈕來調用創建的函數，得到結果-->?
???<input?type='text'?id='fruit'?/>
為什么沒有反應的
最近的距離是多少3456060
2016-08-07 12:17:31
