qq_猫的树_1
2018-08-01 17:18
<!DOCTYPE html><html> <head> <title> 事件</title> <script type="text/javascript"> function count(){ var one=parseInt(document.getElemenById("text1").value); //获取第一个输入框的值 var two=parseInt(document.getElemenById("text2").value); //获取第二个输入框的值 var three=document.getElemenById("select").value; var result=""; //获取选择框的值 switch(three){ care "+"; result = parseFloat(one) + parseFloat(two); break; care "-"; result = parseFloat(one) - parseFloat(two); break; care "*"; result = parseFloat(one) * parseFloat(two); break; care "/"; result = parseFloat(one) / parseFloat(two); break; } document.getElementById("fruit").value = result; } //获取通过下拉框来选择的值来改变加减乘除的运算法则 //设置结果输入框的值 } </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() /> <!--通过 = 按钮来调用创建的函数,得到结果--> <input type='text' id='fruit' /> </body></html>
switch搭配的是case不是care,其次case后面跟的是":"不是";"
<html>
<head>
<title> 事件</title>
<script type="text/javascript">
function count(){
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>
</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() /> <!--通过 = 按钮来调用创建的函数,得到结果-->
<input type='text' id='fruit' />
</body>
</html>
“onclick=count()”这样写就没错了
onclick点击事件加上引号就可以了 改成onclick="count()"
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