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December 19, 2015 13:59
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Custom object property
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| var obj = { | |
| x : 5, | |
| y : 10 | |
| }; | |
| // defineProperty doesn't work on IE < 9, IE8 only when it's a DOM element | |
| Object.defineProperty(obj, 'sum', { | |
| get: function(){ | |
| return this.x + this.y | |
| } | |
| }); | |
| console.log(obj.sum === 15) | |
| obj.x = 1; | |
| obj.y = 3; | |
| console.log(obj.sum == 4) | |
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