Created
March 21, 2019 14:34
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Vue源码cached函数
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| function cached(callback){ | |
| let cached = {} | |
| return function(id){ | |
| const hit = cached[id] | |
| return hit || (cached[id] = callback[id]) | |
| } | |
| } | |
| //使用 | |
| const idToTemplate = cached(id => { | |
| const el = query(id) | |
| return el && el.innerHTML | |
| }) | |
| //这样多次调用如下：idToTemplate(template)，不会多次执行query方法 | |
| template = idToTemplate(template) | |
| template = idToTemplate(template) |
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