ECMAScript 5有filter()
个原型,用于Array
种类型,但如果我理解正确的话,不是Object
种类型.
我如何在JavaScript中实现filter()
forObject
s?
假设我有这个对象:
var foo = {
bar: "Yes"
};
我想写一个能在Object
上工作的filter()
:
Object.prototype.filter = function(predicate) {
var result = {};
for (key in this) {
if (this.hasOwnProperty(key) && !predicate(this[key])) {
result[key] = this[key];
}
}
return result;
};
当我在下面的演示中使用它时,这是可行的,但当我将它添加到使用jQuery 1.5和jQuery UI 1.8.9的网站时,我会在FireBug中看到JavaScript错误.
Object.prototype.filter = function(predicate) {
var result = {};
for (key in this) {
if (this.hasOwnProperty(key) && !predicate(this[key])) {
console.log("copying");
result[key] = this[key];
}
}
return result;
};
var foo = {
bar: "Yes",
moo: undefined
};
foo = foo.filter(function(property) {
return typeof property === "undefined";
});
document.getElementById('disp').innerHTML = JSON.stringify(foo, undefined, ' ');
console.log(foo);
#disp {
white-space: pre;
font-family: monospace
}
<div id="disp"></div>