Array.push()如果不存在?
如果两个值都不存在,如何推入数组?这是我的数组:
[ { name: "tom", text: "tasty" },
{ name: "tom", text: "tasty" },
{ name: "tom", text: "tasty" },
{ name: "tom", text: "tasty" },
{ name: "tom", text: "tasty" }
]
如果我尝试使用name: "tom"
或再次将其推入数组text:
"tasty",我什么都不希望发生…但是如果这两个都不存在,那么我希望它.push()
我怎样才能做到这一点?
回答:
您可以使用自定义方法扩展Array原型:
// check if an element exists in array using a comparer function// comparer : function(currentElement)
Array.prototype.inArray = function(comparer) {
for(var i=0; i < this.length; i++) {
if(comparer(this[i])) return true;
}
return false;
};
// adds an element to the array if it does not already exist using a comparer
// function
Array.prototype.pushIfNotExist = function(element, comparer) {
if (!this.inArray(comparer)) {
this.push(element);
}
};
var array = [{ name: "tom", text: "tasty" }];
var element = { name: "tom", text: "tasty" };
array.pushIfNotExist(element, function(e) {
return e.name === element.name && e.text === element.text;
});
以上是 Array.push()如果不存在? 的全部内容, 来源链接: utcz.com/qa/397289.html