一、第一种声明函数的方式
function 函数名(){
}
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<head>
<title>流程控制语句</title>
</head>
<body>
<script type="text/javascript">
function generateTable(rows ,cols){
document.write("<table border='1' align='center'>");
for(var i=0; i<rows; i++){
document.write("<tr>");
for(var j=0; j<cols; j++){
document.write("<td>" + i + "行" + j + "列" + "</td>");
}
document.write("</tr>")
}
document.write("</table>");
}
</script>
<input type="button" value="生成表格" onclick="generateTable(5,7)"/>
</body>
</html>
二、第二种方式
匿名函数 :var 变量名(函数名)= function(参数列表)
onclick=变量名(参数列表)
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<head>
<title>流程控制语句</title>
</head>
<body>
<script type="text/javascript">
var generateTable = function (rows ,cols){
document.write("<table border='1' align='center'>");
for(var i=0; i<rows; i++){
document.write("<tr>");
for(var j=0; j<cols; j++){
document.write("<td>" + i + "行" + j + "列" + "</td>");
}
document.write("</tr>")
}
document.write("</table>");
}
</script>
<input type="button" value="生成表格" onclick="generateTable(5,7)"/>
</body>
</html>
三、第三种方式:参数,前面都是参数,函数体是最后一个参数
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<head>
<title>function</title>
</head>
<body>
<script type="text/javascript">
var add = new Function("x","y","var result = x + y; return x+y;");
alert(add(4,5));
</script>
</body>
</html>