本文实例讲述了js初始化验证的方法。分享给大家供大家参考，具体如下：
<script type="text/javascript">
var book = function(isbn, title, author) {
if(!this.checkisbn(isbn)){
throw new error('book: invalid isbn.');
}
this.isbn = isbn;
this.title = title || 'no title specified';
this.author = author || 'no author specified';
}
book.prototype = {
checkisbn: function(isbn) {
if(isbn == undefined || typeof isbn != 'string') {
return false;
}
return true; // all tests passed.
},
display: function() {
alert("isbn:"+this.isbn+" title:"+this.title+" author:"+this.author);
}
};
var thehobbit = new book('0-395-07122-4', 'the hobbit', 'j. r. r. tolkein');
thehobbit.display(); // outputs the data by creating and populating an html element.
</script>
对isbn进行验证。是否定义，是否为字符串等等。对title进行判断，设置默认。
另一种实现方式
<script type="text/javascript">
/* 出版 interface. */
/* var publication = new interface('publication', ['getisbn', 'setisbn', 'gettitle',
'settitle', 'getauthor', 'setauthor', 'display']); */
var book = function(isbn, title, author) { // implements publication
this.setisbn(isbn);
this.settitle(title);
this.setauthor(author);
}
book.prototype = {
checkisbn: function(isbn) {
if(isbn == undefined || typeof isbn != 'string') {
return false;
}
return true; // all tests passed.
},
getisbn: function() {
return this.isbn;
},
setisbn: function(isbn) {
if(!this.checkisbn(isbn)) throw new error('book: invalid isbn.');
this.isbn = isbn;
},
gettitle: function() {
return this.title;
},
settitle: function(title) {
this.title = title || 'no title specified';
},
getauthor: function() {
return this.author;
},
setauthor: function(author) {
this.author = author || 'no author specified';
},
display: function() {
alert("isbn:"+this.isbn+" title:"+this.title+" author:"+this.author);
}
};
var thehobbit = new book('0-395-07122-4', '', 'j. r. r. tolkein');
thehobbit.display(); // outputs the data by creating and populating an html element.
</script>
接口实现，参考接口，定义了好多方法。
内部方法命名加_，例如这个检测的方法 _checkisbn
<script type="text/javascript">
/* 出版 interface. */
/* var publication = new interface('publication', ['getisbn', 'setisbn', 'gettitle',
'settitle', 'getauthor', 'setauthor', 'display']); */
var book = function(isbn, title, author) { // implements publication
this.setisbn(isbn);
this.settitle(title);
this.setauthor(author);
}
book.prototype = {
_checkisbn: function(isbn) {
if(isbn == undefined || typeof isbn != 'string') {
return false;
}
return true; // all tests passed.
},
getisbn: function() {
return this.isbn;
},
setisbn: function(isbn) {
if(!this._checkisbn(isbn)) throw new error('book: invalid isbn.');
this.isbn = isbn;
},
gettitle: function() {
return this.title;
},
settitle: function(title) {
this.title = title || 'no title specified';
},
getauthor: function() {
return this.author;
},
setauthor: function(author) {
this.author = author || 'no author specified';
},
display: function() {
alert("isbn:"+this.isbn+" title:"+this.title+" author:"+this.author);
}
};
//var thehobbit = new book(123, '', 'j. r. r. tolkein'); // 非字符串抛出异常
var thehobbit = new book('1990-78sd-1092', '', 'j. r. r. tolkein');
thehobbit.display(); // outputs the data by creating and populating an html element.
</script>