133、函数计算】

133、函数计算】

脚本说明:

把如下代码加入<body>区域中:

<SCRIPT LANGUAGE="JavaScript">

 

<!-- Begin

var a, b, c;

function xtop(form) {

form.u.value = (form.b.value * -1) / (form.a.value * 2);

}

function ytop(form) {

form.u2.value = -1 * (form.b.value * form.b.value) / (4 * form.a.value) - (-1 * form.c.value);

}

function doCoord(form) {

form.co.value = form.u.value + "," + form.u2.value;

}

function disc(form) {

form.o.value = (form.b.value * form.b.value) - (form.a.value * form.c.value * 4);

}

function zeroes1(form) {

form.n.value = ((form.b.value * -1) - (Math.sqrt(form.o.value))) / (form.a.value * 2);

}

function zeroes2(form) {

form.n2.value = ((form.b.value * -1) - (-1 * Math.sqrt(form.o.value))) / (form.a.value * 2);

}

function move_in(img_name,img_src) {

document[img_name].src=img_src;

}

//  End -->

</script>

<form>

<table bgcolor="#C0C0C0" cellspacing=2 cellpadding=2 border=3>

<tr>

<td>

<b>

<h3>Parabolic Calculator</h3>

<input name="a" size="3">X<sup>2</sup>+

<input name="b" size="3">X +

<input name="c" size="3">

<br>

<input type="button" value="x-top" name="x-top" onclick="xtop(this.form)">

<input type="button" value="y-top" name="y-top" onclick="ytop(this.form)">

<input type="button" value="crd" name="crd" onclick="doCoord(this.form)">

<input type="button" value="disc." name="D" onclick="disc(this.form)">

<br>

<input type="button" value="0-points" name="zeroes" onclick="zeroes1(this.form);zeroes2(this.form)">

<input type="button" onclick="xtop(this.form);ytop(this.form);doCoord(this.form);disc(this.form);zeroes1(this.form);zeroes2(this.form)" value="do all">

<input type="button" name="pics" value="show e.g." onClick="if(form.a.value>0 && form.o.value>0)move_in('p','p2.gif');if (form.a.value<0 && form.o.value>0)move_in('p','p3.gif'); if(form.a.value>0 && form.o.value==0) move_in('p','p4.gif'); if(form.a.value<0 && form.o.value==0) move_in('p','p5.gif'); if(form.a.value>0 && form.o.value<0) move_in('p','p6.gif'); if(form.a.value<0 && form.o.value<0) move_in('p','p7.gif')" value="show e.g.">

<br>

<input type="text" name="u" size="8"> x-top<br>

<input type="text" name="u2" size="8"> y-top<br>

<input type="text" size="8" name="co" onmouseover="form.rem.value=form.co.value"> Coord.<br>

<input type="text" size="8" name="o"> Discriminant<br>

<input type="text" size="8" name="n"> neg zero pt.<br>

<input type="text" size="8" name="n2"> pos zero pt.

<input type="hidden" value="" name="rem"><br>

<input type="reset" value="reset"><br>

</b>

</td>

<td><img src="p1.gif" width=200 name="p" height=200 border=0 alt=""></td>

</tr>

</table>

</form>

 

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