判断Javascript对象是否为空

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于 2017-06-22 14:32:00 发布

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文章标签： javascript ViewUI

原文链接：http://www.cnblogs.com/sea-breeze/p/7064812.html

本文介绍了一种使用jQuery 3.2.1版的isEmptyObject()方法来判断JavaScript对象是否为空的方法，包括自有的和继承的属性。此方法不仅检查对象本身上的属性，也检查从原型继承来的属性。

判断普通javascript对象是否为空（含有可枚举的属性，自有的、继承的都可以），可使用jQuery 3.2.1版的isEmptyObject()方法：

isEmptyObject: function( obj ) {
    var name;
    for ( name in obj ) {
        return false;
    }
    return true;
}

As of jQuery 1.4 this method checks both properties on the object itself and properties inherited from prototypes (in that it doesn't use hasOwnProperty). The argument should always be a plain JavaScript Object as other types of object (DOM elements, primitive strings/numbers, host objects) may not give consistent results across browsers. To determine if an object is a plain JavaScript object, use $.isPlainObject()

转载于:https://www.cnblogs.com/sea-breeze/p/7064812.html