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如果变量 visitor 中的值是 "PRES"，则向变量 greeting 赋值 "Dear President "，否则赋值 "Dear"。
<!DOCTYPE html>
<html>
<body>
<meta http-equiv="Content-Type" content="text/html charset=utf-8"/>
<script>
function Print()
{
var age = 15;
//if(age < 18)
// document.write("Too young");
var visitor = "PRES";
var greeting=(visitor=="PRES")?"Dear President ":"Dear";
document.write(greeting);
}
</script>
<td><input type="text" name="txtRow1" id="txt1" size="40" /></td>
<button onclick="Print()">点击这里</button>
</body>
</html>
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原文地址：http://blog.csdn.net/u012701023/article/details/46313015
