<script>標(biāo)簽位置
點(diǎn)贊最高的代碼中，為什么<script>標(biāo)簽必須放在那個(gè)位置才有用？換到別的位置都不行。求教
藍(lán)色是最溫暖的顏色L
2018-11-14
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2018-11-15
放在下面一樣的，沒問題啊，而且js最好放在這下面，<script src=""></script>也是放在最下面的好
<!DOCTYPE?html> <html>? <head>?? <title>?事件</title>????? </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(diào)用創(chuàng)建的函數(shù)，得到結(jié)果-->???? <input?type='text'?id='fruit'?/>?????? <script?type="text/javascript">?? ?function?count(){???? ?????var?oTxt1?=?document.getElementById("txt1").value;???? ?????var?oTxt2?=?document.getElementById("txt2").value;??? ?????var?oSlt?=?document.getElementById("select").value;???? ?????var?result?=?"";???? ?????switch(oSlt)?{ ?????case?"+":????????????result?=?parseFloat(oTxt1)?+?parseFloat(oTxt2);???????????? ??????????????????????????????break;???????? ?????case?"-":????????????result?=?parseFloat(oTxt1)?-?parseFloat(oTxt2);??????????? ??????????????????????????????break;??????? ?????case?"*":????????????result?=?parseFloat(oTxt1)?*?parseFloat(oTxt2);???????????? ?????????????????????break;???????? ????default:????????????result?=?parseFloat(oTxt1)?/?parseFloat(oTxt2);??? ????}???? ?????document.getElementById("fruit").value?=?result;?????? ??}?? ??</script>?? ??</body> ??</html>