![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script>
// switch
//break 跳出整个 停止switch continue 跳过本条 继续向后执行 default 什么都没选中到此处
var baozi=4;
switch(baozi){
case 1:document.write('吃一个！');
break;
case 2:document.write('吃两个！');
break;
case 3:document.write('吃三个！');
break;
case 4:document.write('吃四个！');
break;
default:document.write('吃duo个');
}
</script>
</head>
<body>
</body>
</html>点击 "运行实例" 按钮查看在线实例
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script>
//乘法表
var a,b;
for (a=1;a<=9;a++) {
document.write('<br />')
for (b=1;b<=a;b++) {
lasy=a*b;
document.write(a,'x',b,'=',lasy, ' ')
}
}
//三角形
document.write('<br />');
var t = 1;
while(t<=10){
var m = 1;
document.write('<center>');
while(m<=t){
document.write('*')
m++;
}
document.write("<br/>");
t++;
document.write('</center>');
}
</script>
</head>
<body style="padding: 20px;">
</body>
</html>点击 "运行实例" 按钮查看在线实例
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script>
var la =1;
while(la<=10){
document.write(la+"<br />");
la++;
}
//do while
var ls = 1;
do{
document.write(ls+"<br />");
ls++;
}while (ls<=5);</script>
</head>
<body style="padding: 20px;">
</body>
</html>点击 "运行实例" 按钮查看在线实例
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script>
//break 跳出整个 停止switch continue 跳过本条 继续向后执行 default 什么都没选中到此处
//do while
var ls = 1;
do{
document.write(ls+"<br />");
ls++;
}while (ls<=5);
//for ...in 用于循环对象属性( for...in 循环中的代码块将针对每个属性执行一次)
var las0=["html","css","JavaScript","jquery","php","mysqli","json","ajax"];
var x
for(x in las0){
document.write(las0[x]+'<br>')
}
//函数 1、只有被调用了才会运行 2函数可以通过一个表达式定义,函数表达式可以存储在变量中
// Function()构造函数 大写
// var obj=new Function(document.write('Time'))
// obj()
// 形参：形式参数，函数名后面的括号中的参数
// 实参：实际参数，是指函数在调用的时候，函数名后面的括号中的参数，它的作用是将函数外面的变量通过实参穿入到函数中。
function showSjx(){
var t = 1;
while(t<=10){
var m = 1;
document.write('<center>');
while(m<=t){
document.write('*')
m++;
}
document.write("<br/>");
t++;
document.write('</center>');
}
}
showSjx();
function names(x,y){
document.write(x+y)
}
names(10,5)
document.write('<br />');
function lasa(c,d){
document.write('nbs');
return c*d;
}
document.write(lasa(10,2));
</script>
</head>
<body style="padding: 20px;">
</body>
</html>点击 "运行实例" 按钮查看在线实例
