Object.keys(obj)返回参数obj可被枚举的属性
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Object.keys(obj),返回一个数组,数组里是该obj可被枚举的所有属性。请看示例:
示例一:
function Pasta(grain, width, shape) {
this.grain = grain;
this.width = width;
this.shape = shape;
this.toString = function () {
return (this.grain + ", " + this.width + ", " + this.shape);
}
}
console.log(Object.keys(Pasta)); //console: []
var spaghetti = new Pasta("wheat", 0.2, "circle");
console.log(Object.keys(spaghetti)); //console: ["grain", "width", "shape", "toString"]
示例二:
var arr = ["a", "b", "c"];
console.log(Object.keys(arr)); // console: ["0", "1", "2"]
var obj = { 0 : "a", 1 : "b", 2 : "c"};
console.log(Object.keys(obj)); // console: ["0", "1", "2"]
var an_obj = { 100: "a", 2: "b", 7: "c"};
console.log(Object.keys(an_obj)); // console: ["2", "7", "100"]
var my_obj = Object.create({}, { getFoo : { value : function () { return this.foo } } });
my_obj.foo = 1;
console.log(Object.keys(my_obj)); // console: ["foo"]
示例一:
function Pasta(grain, width, shape) {
this.grain = grain;
this.width = width;
this.shape = shape;
this.toString = function () {
return (this.grain + ", " + this.width + ", " + this.shape);
}
}
console.log(Object.keys(Pasta)); //console: []
var spaghetti = new Pasta("wheat", 0.2, "circle");
console.log(Object.keys(spaghetti)); //console: ["grain", "width", "shape", "toString"]
示例二:
var arr = ["a", "b", "c"];
console.log(Object.keys(arr)); // console: ["0", "1", "2"]
var obj = { 0 : "a", 1 : "b", 2 : "c"};
console.log(Object.keys(obj)); // console: ["0", "1", "2"]
var an_obj = { 100: "a", 2: "b", 7: "c"};
console.log(Object.keys(an_obj)); // console: ["2", "7", "100"]
var my_obj = Object.create({}, { getFoo : { value : function () { return this.foo } } });
my_obj.foo = 1;
console.log(Object.keys(my_obj)); // console: ["foo"]
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