throttle------节流------

var box = document.getElementById('box') 
box.onclick = throttle(callBack, 500, 1, 2, 3, 4, 5, 6)  
function callBack(...arg) {    
    console.log('事件对象及参数', arg)  
}  
function throttle(fn, wait, ...args) {    
    let timeout    
    return function(...e) {      
        if (!timeout) {        
            timeout = setTimeout(() => {          
                let ary = [...e, ...args]          
                fn.apply(this, ary)          
                timeout = null        
            }, wait)      
         }    
    }  
}