版本1.0
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function throttle (fn,delay) {
var delay = delay || 1000;
var lastTime = 0;
function newFn () {
if(new Date().getTime() - lastTime >= delay){
return fn.apply(this,arguments);
lastTime = new Date().getTime();
}
}
return newFn;
}
版本2.0 原型链上封装
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Function.prototype.throttle = function (delay) {
var fn = this;
var lastTime = 0;
function newFn () {
if(new Date().getTime() - lastTime >= delay){
return fn.apply(this,arguments);
lastTime = new Date().getTime();
}
}
return newFn;
}
版本3.0 这种需求应该很少. 能够new实现继承,
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Function.prototype.throttle = function (delay) {
var fn = this;
var lastTime = 0;
newFn.prototype = fn.prototype;// 这里可用圣杯继承代替.
function newFn () {
if(new Date().getTime() - lastTime >= delay){
return fn.apply(this,arguments);
lastTime = new Date().getTime();
}
}
return newFn;
}
