<center style="width:100%;height:100%;"> <br> <FORM NAME="boxes"> R1= <INPUT TYPE="text" NAME="r1" SIZE=12><br> R2= <INPUT TYPE="text" NAME="r2" SIZE=12><br> R3= <INPUT TYPE="text" NAME="r3" SIZE=12><br> R4= <INPUT TYPE="text" NAME="r4" SIZE=12><br> R5= <INPUT TYPE="text" NAME="r5" SIZE=12><br> R6= <INPUT TYPE="text" NAME="r6" SIZE=12><br> R7= <INPUT TYPE="text" NAME="r7" SIZE=12><br> R8= <INPUT TYPE="text" NAME="r8" SIZE=12><br> R9= <INPUT TYPE="text" NAME="r9" SIZE=12><br> R10= <INPUT TYPE="text" NAME="r10" SIZE=12><br> </form> <form> <INPUT TYPE="button" VALUE="计算" SIZE = 20 ONCLICK="calc(boxes); return true" class="calc"> </form> <FORM NAME="answer"> <INPUT TYPE="text" NAME="r11" SIZE=20> </form> <FORM> <INPUT TYPE="button" VALUE="重置" SIZE="25" class="calc" ONCLICK="clearboxes(boxes); return true"> </form> <FORM NAME="box"> 有效数字 >>> <INPUT TYPE="text" NAME="b9" VALUE=10 SIZE="7"> <br><br> <br><br> </center> </form> <script language = JavaScript> var sigfig=10; var R1=0; var R2=0; var R3=0; var R4=0; var R5=0; var R6=0; var R7=0; var R8=0; var R9=0; var R10=0; var total=0; </script> <script language = JavaScript> function clearboxes(boxes) { total=0; document.boxes.r1.value="" document.boxes.r2.value="" document.boxes.r3.value="" document.boxes.r4.value="" document.boxes.r5.value="" document.boxes.r6.value="" document.boxes.r7.value="" document.boxes.r8.value="" document.boxes.r9.value="" document.boxes.r10.value="" document.answer.r11.value=""; R1=0; R2=0; R3=0; R4=0; R5=0; R6=0; R7=0; R8=0; R9=0; R10=0; } </script> <script language = JavaScript> function calc(boxes) { if (document.boxes.r1.value!=""){R1=document.boxes.r1.value;R1=(1/R1)}; if (document.boxes.r2.value!=""){R2=document.boxes.r2.value;R2=(1/R2)}; if (document.boxes.r3.value!=""){R3=document.boxes.r3.value;R3=(1/R3)}; if (document.boxes.r4.value!=""){R4=document.boxes.r4.value;R4=(1/R4)}; if (document.boxes.r5.value!=""){R5=document.boxes.r5.value;R5=(1/R5)}; if (document.boxes.r6.value!=""){R6=document.boxes.r6.value;R6=(1/R6)}; if (document.boxes.r7.value!=""){R7=document.boxes.r7.value;R7=(1/R7)}; if (document.boxes.r8.value!=""){R8=document.boxes.r8.value;R8=(1/R8)}; if (document.boxes.r9.value!=""){R9=document.boxes.r9.value;R9=(1/R9)}; if (document.boxes.r10.value!=""){R10=document.boxes.r10.value;R10=(1/R10)}; total = R1+R2+R3+R4+R5+R6+R7+R8+R9+R10; total = 1/total; sigfig=eval((document.box.b9.value)-1); if (sigfig>-1){ total=total.toExponential(sigfig); if (total>.001 && total <1000){total=total*1} } document.answer.r11.value=" "+total; total=0;R1=0;R2=0;R3=0;R4=0;R5=0;R6=0;R7=0;R8=0;R9=0;R10=0; } document.onkeydown = function (e) { // 回车提交表单 // 兼容FF和IE和Opera var theEvent = window.event || e; var code = theEvent.keyCode || theEvent.which || theEvent.charCode; if (code == 13) { calc(boxes); } } </script> R1= R2= R3= R4= R5= R6= R7= R8= R9= R10= 有效数字 >>> 赞 看都看了，点个赞吧！
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