function throttle(fn,time){var startTime = new Date();return function(){var time_ = (new Date() - startTime) >= time;if(time_){fn.apply(this);startTime = new Date();}}
}
function fn(){console.log("觸發了事件");
}
window.onscroll = throttle(fn,1000);
高階函數、偏函數
function makeUniqueStringFunction(start) {var COUNTER = start;return function(prefix) {return [prefix, COUNTER++].join('');}
};
var uniqueString = makeUniqueStringFunction(0);uniqueString("dari");
//=> "dari0"uniqueString("dari");
//=> "dari1"
