為啥1+1會等于11...？？
其他運算沒問題 就是加法出問題
qq_主流革新ZG_03388100
2016-06-28
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2016-06-28
document.getElementById("txt1").value 獲取的值為字符串 需要用parseInt()函數解析字符串為整數,如果不能解析會返回?NaN, ?所以你獲取文本框的值后 還需要轉換 ,如下代碼這么寫:parseInt(document.getElementById("txt1").value);
2016-06-28
?<script?type="text/javascript"> ???function?count(){ ???????var?otxt1=document.getElementById("txt1").value; ???????var?otxt2=document.getElementById("txt2").value; ???????var?oselect=document.getElementById("select").value; ???????var?result=""; ???????switch(oselect) ???????{ ???????????case?"+": ???????????result=otxt1+otxt2; ???????????break; ???????????case"-": ???????????result=otxt1-otxt2; ???????????break; ???????????case"*": ???????????result=otxt1*otxt2; ???????????break; ???????????default: ???????????result=otxt1/otxt2; ???????} ????document.getElementById("fruit").value=result; ???? ???} ??</script>