JavaScript如何根据属性过滤对象数组?
我有以下JavaScript数组的房地产主页对象:
var json = { 'homes': [{
"home_id": "1",
"price": "925",
"sqft": "1100",
"num_of_beds": "2",
"num_of_baths": "2.0",
}, {
"home_id": "2",
"price": "1425",
"sqft": "1900",
"num_of_beds": "4",
"num_of_baths": "2.5",
},
// ... (more homes) ...
]
}
var xmlhttp = eval('(' + json + ')');
homes = xmlhttp.homes;
我想做的是能够对对象执行过滤,以返回“家庭”对象的子集。
例如,我想根据能够过滤:price
,sqft
,num_of_beds
,和num_of_baths
。
如何在JavaScript中执行类似下面的伪代码的操作:
var newArray = homes.filter( price <= 1000 &
sqft >= 500 &
num_of_beds >=2 &
num_of_baths >= 2.5 );
注意,语法不必与上面完全相同。这只是一个例子。
回答:
您可以使用以下Array.prototype.filter
方法:
var newArray = homes.filter(function (el) { return el.price <= 1000 &&
el.sqft >= 500 &&
el.num_of_beds >=2 &&
el.num_of_baths >= 2.5;
});
现场示例:
var obj = { 'homes': [{
"home_id": "1",
"price": "925",
"sqft": "1100",
"num_of_beds": "2",
"num_of_baths": "2.0",
}, {
"home_id": "2",
"price": "1425",
"sqft": "1900",
"num_of_beds": "4",
"num_of_baths": "2.5",
},
// ... (more homes) ...
]
};
// (Note that because `price` and such are given as strings in your object,
// the below relies on the fact that <= and >= with a string and number
// will coerce the string to a number before comparing.)
var newArray = obj.homes.filter(function (el) {
return el.price <= 1000 &&
el.sqft >= 500 &&
el.num_of_beds >= 2 &&
el.num_of_baths >= 1.5; // Changed this so a home would match
});
console.log(newArray);
此方法是新ECMAScript 5th Edition标准的一部分,几乎可以在所有现代浏览器中找到。
对于IE,您可以包括以下兼容性方法:
if (!Array.prototype.filter) { Array.prototype.filter = function(fun /*, thisp*/) {
var len = this.length >>> 0;
if (typeof fun != "function")
throw new TypeError();
var res = [];
var thisp = arguments[1];
for (var i = 0; i < len; i++) {
if (i in this) {
var val = this[i];
if (fun.call(thisp, val, i, this))
res.push(val);
}
}
return res;
};
}
以上是 JavaScript如何根据属性过滤对象数组? 的全部内容, 来源链接: utcz.com/qa/433416.html