Javascript 为什么使用document.write不';不在浏览器上显示文本
我有这段代码一个是js文件,另一个是html文件,问题是当我运行代码时浏览器没有显示函数文档中的文本。写(…),有人能帮我吗Javascript 为什么使用document.write不';不在浏览器上显示文本,javascript,html,document.write,Javascript,Html,Document.write,我有这段代码一个是js文件,另一个是html文件,问题是当我运行代码时浏览器没有显示函数文档中的文本。写(…),有人能帮我吗 函数散文(名称,campany){ this.name=name; 这个公司=公司; 这个比率=比率; } 文件 var y=新散文(“JavaScript”、“Packt Publishing”); y、 比率(50); 文件。书写(“书名为“+y.name+””; 文件。书写(“出版公司名称为:“+y.company+””; 文件。书写(“本书的成本为“$”+y.
函数散文(名称,campany){
this.name=name;
这个公司=公司;
这个比率=比率;
}
文件
var y=新散文(“JavaScript”、“Packt Publishing”);
y、 比率(50);
文件。书写(“书名为“+y.name+”
”;
文件。书写(“出版公司名称为:“+y.company+”
”;
文件。书写(“本书的成本为“$”+y.sellingPrice+”
”;
此代码有效
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<script>
function prose(name, company) {
this.name = name,
this.company = company,
this.rate = 0
}
var y = new prose("JavaScript", "Packet Publishing");
y.rate = 30;
document.write("The name of the book is " + y.name + "<br>");
document.write("The name of the publishing company is : " + y.company + "<br>");
document.write("The cost of the book is $" + y.rate + "<br>");
</script>
<!--Ejemplo 5
<a href="javascript:PacktPub()">Click Here</a> -->
</body>
</html>
文件
职能(名称、公司){
this.name=name,
这个公司,
这个比率=0
}
var y=新散文(“JavaScript”,“数据包发布”);
y、 比率=30;
文件。书写(“书名为“+y.name+”
”;
文件。书写(“出版公司名称为:“+y.company+”
”;
文件。书写(“这本书的成本是$”+y.rate+“
”);
您有一些语法错误(campany->company,rate->sellingPrice)。此代码有效
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<script>
function prose(name, company) {
this.name = name,
this.company = company,
this.rate = 0
}
var y = new prose("JavaScript", "Packet Publishing");
y.rate = 30;
document.write("The name of the book is " + y.name + "<br>");
document.write("The name of the publishing company is : " + y.company + "<br>");
document.write("The cost of the book is $" + y.rate + "<br>");
</script>
<!--Ejemplo 5
<a href="javascript:PacktPub()">Click Here</a> -->
</body>
</html>
文件
职能(名称、公司){
this.name=name,
这个公司,
这个比率=0
}
var y=新散文(“JavaScript”,“数据包发布”);
y、 比率=30;
文件。书写(“书名为“+y.name+”
”;
文件。书写(“出版公司名称为:“+y.company+”
”;
文件。书写(“这本书的成本是$”+y.rate+“
”);
您有一些语法错误(campany->company,rate->sellingPrice)。您有几个错误。
首先,您引用的是公司
,它在您编写坎帕尼
时并不存在
改为:
函数散文(名称、公司)
其次,pross
是一个函数,而不是一个类,因此它无法识别您正在调用的新的。要解决此问题,请删除新的或将其更改为类:
let prose = (() =>{
function prose(name, company, rate) {
this.name= name;
this.company = company;
this.rate = rate;
}
return prose;
})();
同时也修正了你设定利率的方式
y.rate = 50;
你有几个错误。
首先,您引用的是公司
,它在您编写坎帕尼
时并不存在
改为:
函数散文(名称、公司)
其次,pross
是一个函数,而不是一个类,因此它无法识别您正在调用的新的。要解决此问题,请删除新的或将其更改为类:
let prose = (() =>{
function prose(name, company, rate) {
this.name= name;
this.company = company;
this.rate = rate;
}
return prose;
})();
同时也修正了你设定利率的方式
y.rate = 50;
这应该可以解释一切
<body>
<script>
// Defines an object prototype called prose
function prose(name, company){
// Any parameter names used inside the constructor must exist in its
// signature above
this.name = name;
this.company = company;
// prose.rate is initially set to an empty string because no rate
// argument is passed in
this.rate = "";
}
// Constructs a new object using the `prose` prototype. (Note that
// JS now also has 'class' syntax available.)
const y = new prose("JavaScript", "Packt Publishing");
// It would be better to use a more descriptive identifier than `y`
// Assigns a new value to the rate property of the new object.
y.rate = 50;
// We will not use `document.write()` because it replaces all
// existing page content each time it is used
// The paragraph element (and others) could be included in static
// HTML instead of added dynamically using javascript as we do here
// Defines nodes to add to the document
const myParagraph = document.createElement("p");
const nameText = document.createTextNode("The name of the book is: " + y.name);
const companyText = document.createTextNode("The name of the publishing company is: " + y.company);
//priceText includes a fallback string in case y.sellingPrice does not exist
const priceText = document.createTextNode("The selling price of the book is: " + (y.sellingPrice || "(unknown)"));
const rateText = document.createTextNode("The rate of the book is: " + y.rate);
// This function can be called repeatedly to create & append a line break
function appendLineBreakTo(parentElement){
const lineBreak = document.createElement("br");
parentElement.appendChild(lineBreak);
}
// Adds all the text nodes inside the newly created paragraph element
myParagraph.appendChild(nameText);
appendLineBreakTo(myParagraph); //Calls function to add <br/>
myParagraph.appendChild(companyText);
appendLineBreakTo(myParagraph);
myParagraph.appendChild(priceText);
appendLineBreakTo(myParagraph);
myParagraph.appendChild(rateText);
appendLineBreakTo(myParagraph);
// Gets a reference to an HTML element that already exists in the DOM
const body = document.querySelector("body");
// Adds the paragraph element (with all of its new text nodes) to
// the existing element
body.appendChild(myParagraph);
</script>
</body>
//定义一个名为散文的对象原型
职能(名称、公司){
//构造函数中使用的任何参数名称都必须存在于其
//上面签名
this.name=名称;
这个公司=公司;
//Pross.rate最初设置为空字符串,因为没有速率
//参数被传入
此值为“=”;
}
//使用“散文”原型构造新对象。(注意
//JS现在还提供了“类”语法。)
const y=新散文(“JavaScript”,“Packt Publishing”);
//最好使用比“y”更具描述性的标识符`
//将新值指定给新对象的“速率”特性。
y、 比率=50;
//我们不会使用“document.write()”,因为它会替换所有
//每次使用现有页面内容时
//段落元素(和其他元素)可以包含在静态
//HTML,而不是像我们在这里所做的那样使用javascript动态添加
//定义要添加到文档中的节点
const my段落=document.createElement(“p”);
const nameText=document.createTextNode(“书的名称为:”+y.name);
const companyText=document.createTextNode(“发布公司的名称为:“+y.company”);
//priceText在y.sellingPrice不存在的情况下包含回退字符串
const priceText=document.createTextNode(“该书的售价为:+(y.sellingPrice | |(未知)”);
const rateText=document.createTextNode(“书本的速率为:”+y.rate);
//可以重复调用此函数以创建和追加换行符
函数appendLineBreakTo(parentElement){
const lineBreak=document.createElement(“br”);
parentElement.appendChild(换行符);
}
//在新创建的段落元素中添加所有文本节点
我的段落.appendChild(nameText);
附件(我的段落)//调用要添加的函数
我的段落.appendChild(companyText);
附件(我的段落);
我的段落.appendChild(价格文本);
附件(我的段落);
我的段落.appendChild(文本);
附件(我的段落);
//获取对DOM中已存在的HTML元素的引用
const body=document.querySelector(“body”);
//将段落元素(及其所有新文本节点)添加到
//现有要素
正文.附件(我的段落);
这应该可以解释一切
<body>
<script>
// Defines an object prototype called prose
function prose(name, company){
// Any parameter names used inside the constructor must exist in its
// signature above
this.name = name;
this.company = company;
// prose.rate is initially set to an empty string because no rate
// argument is passed in
this.rate = "";
}
// Constructs a new object using the `prose` prototype. (Note that
// JS now also has 'class' syntax available.)
const y = new prose("JavaScript", "Packt Publishing");
// It would be better to use a more descriptive identifier than `y`
// Assigns a new value to the rate property of the new object.
y.rate = 50;
// We will not use `document.write()` because it replaces all
// existing page content each time it is used
// The paragraph element (and others) could be included in static
// HTML instead of added dynamically using javascript as we do here
// Defines nodes to add to the document
const myParagraph = document.createElement("p");
const nameText = document.createTextNode("The name of the book is: " + y.name);
const companyText = document.createTextNode("The name of the publishing company is: " + y.company);
//priceText includes a fallback string in case y.sellingPrice does not exist
const priceText = document.createTextNode("The selling price of the book is: " + (y.sellingPrice || "(unknown)"));
const rateText = document.createTextNode("The rate of the book is: " + y.rate);
// This function can be called repeatedly to create & append a line break
function appendLineBreakTo(parentElement){
const lineBreak = document.createElement("br");
parentElement.appendChild(lineBreak);
}
// Adds all the text nodes inside the newly created paragraph element
myParagraph.appendChild(nameText);
appendLineBreakTo(myParagraph); //Calls function to add <br/>
myParagraph.appendChild(companyText);
appendLineBreakTo(myParagraph);
myParagraph.appendChild(priceText);
appendLineBreakTo(myParagraph);
myParagraph.appendChild(rateText);
appendLineBreakTo(myParagraph);
// Gets a reference to an HTML element that already exists in the DOM
const body = document.querySelector("body");
// Adds the paragraph element (with all of its new text nodes) to
// the existing element
body.appendChild(myParagraph);
</script>
</body>
//定义一个名为散文的对象原型
职能(名称、公司){
//构造函数中使用的任何参数名称都必须存在于其
//上面签名
this.name=名称;
这个公司=公司;
//Pross.rate最初设置为空字符串,因为没有速率
//参数被传入
此值为“=”;
}
//使用“散文”原型构造新对象。(注意
//JS现在还提供了“类”语法。)
const y=新散文(“JavaScript”,