JavaScript不从HTML表单中获取值_Javascript_Html_Forms_Oop_Dom

JavaScript不从HTML表单中获取值

javascript html forms oop dom

JavaScript不从HTML表单中获取值,javascript,html,forms,oop,dom,Javascript,Html,Forms,Oop,Dom,我目前正在尝试制作一个解决Kremer规则的项目，但是，我的JS没有打印到浏览器上。这就是我到目前为止所做的：我想知道我将如何处理我的代码以打印到浏览器：我用错方法了吗？我应该使用“getElementById（）”函数来获取值吗。在函数中声明类是否存在问题在调用函数之前，它只在表单上方的文档中写入“document.write”（“等式为：”）；” <!DOCTYPE html> <html> <head> <title>Kreme

我目前正在尝试制作一个解决Kremer规则的项目，但是，我的JS没有打印到浏览器上。这就是我到目前为止所做的：

我想知道我将如何处理我的代码以打印到浏览器：我用错方法了吗？我应该使用“getElementById（）”函数来获取值吗。在函数中声明类是否存在问题

在调用函数之前，它只在表单上方的文档中写入“document.write”（“等式为：”）；”

<!DOCTYPE html>
<html>
<head>
    <title>Kremer's rule</title>
    <link type="text/css" rel="stylesheet" href="stylesheet.css" />
    <h1>Solve Kremer's Rule</h1>

    <SCRIPT LANGUAGE="JavaScript">
    function testResults (form) {

        function system (x1, x2, x3, y1, y2, y3, z1, z2, z3, a1, a2, a3){
           this.x1 = x1;
           this.x2 = x2;
           this.x3 = x3;
           this.y1 = y1;
           this.y2 = y2;
           this.y3 = y3;
           this.z1 = z1;
           this.z2 = z2;
           this.z3 = z3;
           this.a1 = a1;
           this.a2 = a2;
           this.a3 = a3;
           this.calcDanswer = function() {
               return (this.x1*((this.y2*this.z3)-(this.z2*this.y3))) - (this.y1*((this.x2*this.z3)-(this.z2*this.x3))) + (this.z1*((this.x2*D.y3)- (this.y2*this.x3)));
           };
           this.calcXanswer = function(){
               return (this.a1*((this.y2*this.z3)-(this.z2*this.y3))) - (this.y1*((this.a2*this.z3)-(this.z2*this.a3))) + (this.z1*((this.a2*this.y3)-(this.y2*this.a3)));
           };
           this.calcYanswer = function(){
               return (this.x1*((this.a2*this.z3)-(this.z2*this.a3))) - (this.a1*((this.x2*this.z3)-(this.z2*this.x3))) + (this.z1*((this.x2*this.a3)-(this.a2*this.x3)));
           };
           this.calcZanswer = function(){
               return (this.x1*((this.y2*this.a3)-(this.a2*this.y3))) - (this.y1*((this.x2*this.a3)-(this.a2*this.x3))) + (this.a1*((this.x2*this.y3)-(this.y2*this.x3)));
           };
        }

        var x1 = form.x1.value;
        var x2 = form.x2.value;
        var x3 = form.x3.value;
        var y1 = form.y1.value;
        var y2 = form.y2.value;
        var y3 = form.y3.value;
        var z1 = form.z1.value;
        var z2 = form.z2.value;
        var z3 = form.z3.value;
        var a1 = form.a1.value;
        var a2 = form.a2.value;
        var a3 = form.a3.value;

        var D = new system(x1, x2, x3, y1, y2, y3, z1, z2, z3, a1, a2, a3);
        var X = D.calcXanswer()/D.calcDanswer();
        var Y = D.calcYanswer()/D.calcDanswer();
        var Z = D.calcZanswer()/D.calcDanswer();
    }

      //printing to console
       document.write("The equations are:");
       document.write(D.x1 + "x + " + D.y1 + "y + " + D.z1 +"z = "+D.a1);
       document.write(D.x2 + "x + " + D.y2 + "y + " + D.z2 +"z = "+D.a2);
       document.write(D.x3 + "x + " + D.y3 + "y + " + D.z3 +"z = "+D.a3);

       document.write("The answer for D is " + D.calcDanswer());
       document.write("The answer for Dx is " + D.calcXanswer());
       document.write("The answer for Dy is " + D.calcYanswer());
       document.write("The answer for Dy is " + D.calcZanswer());
       document.write();
       document.write("X is " + X);
       document.write("Y is " + Y);
       document.write("Z is " + Z);
    </SCRIPT>

</head>

<body>
    <!--Explaination-->
    <div>
        <h2><span id="highlight">What this does</span></h2>
        <p>Type in all the information for your system of three equations.<br />
        When finished hit "Go".</p>
    </div>

    <!--Form-->
    <div class="matrix">
        <FORM NAME="myform" ACTION="" METHOD="GET">
        <input type="text" name="x1"> x + <input type="text" name="y1"> y + <input type="text" name="z1"> z = <input type="text" name="a1"><br />
        <input type="text" name="x2"> x + <input type="text" name="y2"> y + <input type="text" name="z2"> z = <input type="text" name="a2"><br />
        <input type="text" name="x3"> x + <input type="text" name="y3"> y + <input type="text" name="z3"> z = <input type="text" name="a3"><br />
        <INPUT TYPE="button" NAME="button" Value="Click" onClick="testResults(this.form)">
        </form>
    </div>

    <!--Answer-->
    <div id="answer">
        <h1><span id="highlight">The Answer:</span></h2>
            hiyhioiihhoihohhi<br/>
    </div>
</body>

</html>


克雷默法则
解克雷默法则
函数测试结果（表格）{
功能系统（x1、x2、x3、y1、y2、y3、z1、z2、z3、a1、a2、a3）{
这是1.x1=x1；
这是0.x2=x2；
这1.x3=x3；
这是1.y1=y1；
这1.y2=y2；
这1.y3=y3；
这是1.z1=z1；
这1.z2=z2；
这1.z3=z3；
这1.a1=a1；
这1.a2=a2；
这1.a3=a3；
this.calcDanswer=函数（）{
返回（this.x1*（（this.y2*this.z3）-（this.z2*this.y3））-（this.y1*（（this.x2*this.z3）-（this.z2*this.x3））+（this.z1*（（this.x2*D.y3）-（this.y2*this.x3））；
};
this.calcXanswer=函数（）{
返回（this.a1*（（this.y2*this.z3）-（this.z2*this.y3））-（this.y1*（（this.a2*this.z3）-（this.z2*this.a3））+（this.z1*（（this.a2*this.y3）-（this.y2*this.a3））；
};
this.calcYanswer=函数（）{
返回（this.x1*（（this.a2*this.z3）-（this.z2*this.a3））-（this.a1*（（this.x2*this.z3）-（this.z2*this.x3））+（this.z1*（（this.x2*this.a3）-（this.a2*this.x3））；
};
this.calcZanswer=函数（）{
返回（this.x1*（（this.y2*this.a3）-（this.a2*this.y3））-（this.y1*（（this.x2*this.a3）-（this.a2*this.x3））+（this.a1*（（this.x2*this.y3）-（this.y2*this.x3））；
};
}
var x1=形式x1.值；
var x2=形式x2.值；
var x3=form.x3.value；
变量y1=形式y1.值；
var y2=form.y2.value；
var y3=形式y3.价值；
var z1=形式z1.值；
var z2=形式z2.值；
var z3=形式z3.值；
var a1=形式a1.值；
var a2=形式a2.值；
var a3=表a3.值；
var D=新系统（x1、x2、x3、y1、y2、y3、z1、z2、z3、a1、a2、a3）；
var X=D.calcXanswer（）/D.calcDanswer（）；
变量Y=D.calcYanswer（）/D.calcDanswer（）；
var Z=D.calcZanswer（）/D.calcDanswer（）；
}
//打印到控制台
写下（“方程式为：”）；
文件写入（D.x1+“x+”+D.y1+“y+”+D.z1+“z=“+D.a1”）；
文件写入（D.x2+“x+”+D.y2+“y+”+D.z2+“z=“+D.a2”）；
文件写入（D.x3+“x+”+D.y3+“y+”+D.z3+“z=“+D.a3”）；
document.write（“D的答案是”+D.calcDanswer（））；
document.write（“Dx的答案是”+D.calcXanswer（））；
document.write（“Dy的答案是”+D.calcYanswer（））；
document.write（“Dy的答案是”+D.calcZanswer（））；
document.write（）；
文件。写入（“X是”+X）；
文件。写入（“Y是”+Y）；
文件。写入（“Z是”+Z）；
这是干什么的
输入三方程组的所有信息。

完成后点击“开始”
x+y+z=

x+y+z=

x+y+z=

答案是：
HIYHIOIHHOIHHI

您的

D、X、Y、Z

变量是

testResults

的本地变量，您试图在

testResults

之外使用它们

您可能只想移动

文档。在testResults
中写入

s，更好的方法是操作DOM，这样您就不会丢失页面中的所有内容

你得到了什么错误？它没有给我一个错误，相反，它只是在调用函数之前将“document.write”（“公式是：”）；”写入表单上方的文档。是的，它给了你一个错误，它试图使用未定义的变量。如果您没有使用浏览器控制台/调试器，

function testResults (form) {

    function system (x1, x2, x3, y1, y2, y3, z1, z2, z3, a1, a2, a3){
        ...
    }

    var x1 = form.x1.value;
    var x2 = form.x2.value;
    var x3 = form.x3.value;
    var y1 = form.y1.value;
    var y2 = form.y2.value;
    var y3 = form.y3.value;
    var z1 = form.z1.value;
    var z2 = form.z2.value;
    var z3 = form.z3.value;
    var a1 = form.a1.value;
    var a2 = form.a2.value;
    var a3 = form.a3.value;

    var D = new system(x1, x2, x3, y1, y2, y3, z1, z2, z3, a1, a2, a3);
    var X = D.calcXanswer()/D.calcDanswer();
    var Y = D.calcYanswer()/D.calcDanswer();
    var Z = D.calcZanswer()/D.calcDanswer();



    // printing to he apge
    var out = document.getElementById('real-answer');
    out.innerHTML += "The equations are:" +
        D.x1 + "x + " + D.y1 + "y + " + D.z1 +"z = "+D.a1 +
        D.x2 + "x + " + D.y2 + "y + " + D.z2 +"z = "+D.a2 +
        D.x3 + "x + " + D.y3 + "y + " + D.z3 +"z = "+D.a3 +

       "The answer for D is " + D.calcDanswer() + 
       "The answer for Dx is " + D.calcXanswer() +
       "The answer for Dy is " + D.calcYanswer() + 
       "The answer for Dy is " + D.calcZanswer() +
       "X is " + X +
       "Y is " + Y +
       "Z is " + Z;        
}