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throttle.js
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| function throttle (fn, threshold) { | |
| var last, now, context, deferTimer, args | |
| function exec() { | |
| last = now | |
| fn.apply(context, args) | |
| } | |
| return function () { | |
| context = this | |
| now = +new Date | |
| args = arguments | |
| if (last && now < last + threshold) { | |
| clearTimeout(deferTimer) | |
| deferTimer = setTimeout(exec, threshold) | |
| } else { | |
| exec() | |
| } | |
| } | |
| } |
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