[英]how can i get an object's value from an array?
我有這個數組有幾個id和高度。
我怎樣才能獲得特定id的高度?
比如從數組中獲取review-1的值? 這是“500px”?
謝謝。
ar=[];
ar.push({"id":"reiew-1","height":"500px"});
$.each(ar,function(index,value){
alert(value.height); // gets all the heights
});
在循環中使用if條件
ar = [];
ar.push({
"id": "reiew-1",
"height": "500px"
});
$.each(ar, function (index, value) {
if (value.id == 'reiew-1') {
alert(value.height); // gets all the heights
return false;//stop further looping of the array since the value you are looking for is found
}
});
所以你只能使用javascript方法來做這件事
var ar=[];
ar.push({"id":"reiew-1","height":"500px"}, {"id":"reiew-3","height":"500px"});
// function that filter and return object with selected id
function getById(array, id){
return array.filter(function(item){
return item.id == id;
})[0].height || null;
}
// now you can use this method
console.log(getById(ar, "reiew-1"))
您可以使用此代碼演示
你可以去functional
和做這樣的事情:
ar=[
{"id":"reiew-1","height":"500px"},
{"id":"reiew-2","height":"600px"},
{"id":"reiew-3","height":"700px"},
];
filterById=function(value){
return function(o){
return o["id"]===value;
};
}
getAttribute=function(value){
return function(o){
return o[value];
}
}
ar.filter(filterById("reiew-1")).map(getAttribute("height"))
這對眼睛來說很容易:]
這是小提琴
有關更多信息(例如,有關瀏覽器兼容性),以下是MDN鏈接: Array.prototype.filter()
和Array.prototype.map()
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