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书上为什么这么写呢？？？？
书上源程序
<script language="JavaScript">
<!--
function MArray() {
this.length = MArray.arguments.length
for (var i = 0; i < this.length; i++)
this[i+1] = MArray.arguments}
var fArray = new MArray;
fArray[0]="欢迎大家学习javascript这门语言！";
fArray[1]="欢迎大家学习html这门语言！"
fArray[2]="欢迎大家学习asp这门语言！"
fArray[3]="欢迎大家学习vbscript这门语言！"
var x = 1;
var y = 0;
var msg1 = fArray[y];
function newsSee() {
if (x==msg1.length+1) {
y+=1;
if (y > 3) y=0;
document.form1.news2.value=' ';
msg1 = fArray[y];
x=0;}
document.form1.news2.value=msg1.substring(0,x);
x+=1;
setTimeout("newsSee() ",100);
}
// -->
</script>
<body onLoad="newsSee()">
<form name="form1">
<p align=center><input type="text" name="news2" size=40></p>
</form>
</body>
后来改的
<script language="JavaScript">
<!--
/*function MArray() {
this.length = MArray.arguments.length
for (var i = 0; i < this.length; i++)
this[i+1] = MArray.arguments}*/
var fArray = new Array();
fArray[0]="欢迎大家学习javascript这门语言！";
fArray[1]="欢迎大家学习html这门语言！"
fArray[2]="欢迎大家学习asp这门语言！"
fArray[3]="欢迎大家学习vbscript这门语言！"
var x = 1;
var y = 0;
var msg1 = fArray[y];
function newsSee() {
if (x==msg1.length+1) {
y+=1;
if (y > 3) y=0;
document.form1.news2.value=' ';
msg1 = fArray[y];
x=0;}
document.form1.news2.value=msg1.substring(0,x);
x+=1;
setTimeout("newsSee() ",100);
}
// -->
</script>
<body onLoad="newsSee()">
<form name="form1">
<p align=center><input type="text" name="news2" size=40></p>
</form>
</body>
感觉没必要那样写
而且 this[i+1] = MArray.arguments不太理解
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