Object.defineProperties()方法,利用这个方法可以通过描述符一次定义多个属性

2017-06-21 10:34:00
admin
原创
501
<!DOCTYPE html>
<html>
<head>
    <title>Multiple Properties Example</title>
    <script type="text/javascript">

        var book = {};
        
        Object.defineProperties(book, {
            _year: {
                value: 2004
            },
            
            edition: {
                value: 1
            },
            
            year: {            
                get: function(){
                    return this._year;
                },
                
                set: function(newValue){
                    if (newValue > 2004) {
                        this._year = newValue;
                        this.edition += newValue - 2004;
                    }                  
                }            
            }        
        });
           
        book.year = 2005;
        alert(book.edition);   //2

    </script>
</head>
<body>
    <p>Note: this example only works in browsers that have implemented the ECMAScript 5 <code>Object.defineProperty()</code> method (IE9 and Firefox 4).</p>
</body>
</html>
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