JS 防抖动

point：闭包 apply call (...param)

/*
 防抖动 apply 实现
  fnc:需要防抖的函数
  param...:函数的参数列表
  time:防抖时间
  immediate:是否立即执行-- true:第一次有效 之后连续点击无效 直到 最后一次点击开始到防抖时间结束 fnc有效执行
                           false: 从最后一次点击到防抖时间结束 fnc有效执行
  
 debounce_apply(fnc,param...,time,immediate);
*/

var debounce_apply=(function(){
  var timeout;
   return function(){
    var fnc=arguments[0];
    var param=arguments[1];
    var time=arguments[2];
    var immediate=arguments[3];
     if(timeout)clearTimeout(timeout);
     console.log(timeout);
     if(immediate){//立即执行
       //fnc.apply(fnc,param);
        var callNow = !timeout;
         timeout = setTimeout(()=> {
         clearTimeout(timeout);
         timeout = null;
         console.log("timeout=apply=null");
        }, time);
        if(callNow){
        fnc(...param);
        }
     }else{
       timeout=setTimeout(()=>{
        clearTimeout(timeout);
        //fnc.apply(fnc,param);
        fnc(...param);
        timeout=null;
       },time);
     }
   }
})();


/*
 防抖动 call 实现
    testclick:需要防抖的函数
    param:需要对象化的参数列表
    time:防抖时间
    immediate:是否立即执行
    
    
    var param={a:1,b:2,c:3}
    debounce_call(testclick,param,time,immediate);
 
  1.使用call 
        1.1 
            var param={a:1,b:2,c:3};
            fangdou2(testclick,param,2000,false);
            ...
             fnc.call(param);
            testclick(){
               console.log(this.a);
               console.log(this.b);
               console.log(this.c);
             }
        1.2  
             var param={a:1,b:2,c:3};
             fangdou2(testclick,param,2000,false);
             ...
             fnc.call(param);
              testclick(){
               console.log(arguments[0]);
               console.log(arguments[1]);
               console.log(arguments[2]);
             }
        1.3   
            var param={a:1,b:2,c:3};
             fangdou2(testclick,param,2000,false);
             ...
             fnc.call(fnc,param);
              testclick(val){
               console.log(val.a);
               console.log(val.b);
               console.log(val.c);
             }   
*/
var debounce_call=(function(){
  var timeout;
   return function(){
    var fnc=arguments[0];
    var param=arguments[1];
    var time=arguments[2];
    var immediate=arguments[3];
     if(timeout)clearTimeout(timeout);
     console.log(timeout);
     if(immediate){//立即执行
      var callNow = !timeout;
         timeout = setTimeout(()=>{
         clearTimeout(timeout);
         timeout = null;
         console.log(" timeout = call=null");
        }, time);
        if(callNow)
       fnc.call(param);
     }else{
       timeout=setTimeout(()=>{
        clearTimeout(timeout);
        timeout=null;
        fnc.call(param);
       },time);
     }
   }
})();

function testDoudong(flag){
    //"a","b","c";
    var param0=[{name:'wz'},{age:23},{sex:'male'}];
    
    debounce_apply(testclick,param0,1000,flag);
    
    var param={name:'wz',age:23,sex:'male'}
    
    debounce_call(testclick,param,1000,flag);
}
 
 



function testclick(val0,val1,val2){
  console.log("===click test===");
  console.log(arguments);
  console.log(val0);
  console.log(val1);
  console.log(val2);
  console.log(this.name);
  console.log(this.age);
  console.log(this.sex);
}