JavaScript statement structure
1. Experience
Put the constants on the left side when judging
switch in java only supports four types, and javaScript is a weak type, all of which are supported.
Display method:
alert("x="+x);
//将数据直接写到当前页面当中。
document.write("x="+x+"<br/>");2. Code
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<title>Untitled Document</title>
</head>
<body>
<script type="text/javascript">
/*
* 语句：
* 1，顺序结构。
*
* 2，判断结构。
* 代表语句： if.
* 3，选择结构。
* switch
* 4，循环结构。
* while do while for
* 5，其他语句。
* break：跳出选择，跳出循环。
* continue:用于循环语句，结束本次循环继续下次循环。
*/
// alert("abc1");
// alert("abc2");
// ------------------------------------------------
/*
var x = 3;
// if(x=4){//注意。
if(4==x){//建议将常量放左边。以报错来修正代码。
alert("yes");
}else{
alert("no");
}
if(x>1)
alert("a");
else if(x>2)
alert("b");
else if(x>3)
alert("c");
else
alert("d");
*/
// ------------------------------------------------
/*
//选择结构。
var x = "abc";
switch(x){
case "kk":
alert("a");
break;
case "abc":
alert("b");
break;
default:
alert("c");
break;//省略。因为是最后一个语句，后面就是大括号了
}
*/
//循环结构。
/*
var x = 1;
document.write("<font color='blue' >");//颜色控制，html内容
while(x<10)
{
// alert("x="+x);
//将数据直接写到当前页面当中。
document.write("x="+x+"<br/>");
x++;
}
document.write("</font>");
for(var x=0; x<3; x++){
document.write("x="+x);
}
*/
/*
w:for(var x=0; x<3; x++){//标号
for(var y=0; y<4; y++){
document.write("x==="+x);
continue w;//跳出当前循环。
}
}
*/
</script>
</body>
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