Javascript对象数组到字符串数组,更简单的方法?

Ext.each( columnsInfo, function(elem){
    justColumnNames.push(elem.name);
});

你要找的是一个 map() this question 链接到一些您可以使用的插件。

justColumnNames = columnsInfo.map(function(elem) { elem.Name });

您可以轻松地在javascript中添加语法糖。一个常见的方法是为数组实现foreach/map/filter方法。大多数图书馆都这样做。我的实施:

// List object, inherits from Array
function List (array) {
    // Allow List constructor to convert
    // Array object into List object:
    if (array !== undefined) {
        this.push.apply(this,array)
    }

    // each() method. A cross between map and filter:
    this.each = function (callback) {
        var ret = new List();
        for (i=0,l=this.length;i<l;i++) {
            var r = callback(this[i],i);
            if (r !== undefined) {
                ret.push(r);
            }
        }
        return ret;
    }
}
List.prototype = new Array();

// Direct translation of your code:
var justColumnNames = new List();
justColumnNames.each(function(n,i){
   n = columnsInfo[i].Name;
});

// Or the more brief:
var justColumnNames = new List(columnsInfo).each(function(n){return n.Name});

Array.prototype.each = function (callback) {
        // see implementation above ...
}

但我通常不喜欢修改本机对象。