js編程

代碼展現

• 節流函數

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"