1 // 防抖
 2 export function _debounce(fn, delay) {
 3 
 4     var delay = delay || 200;
 5     var timer;
 6     return function () {
 7         var th = this;
 8         var args = arguments;
 9         if (timer) {
10             clearTimeout(timer);
11         }
12         timer = setTimeout(function () {
13             timer = null;
14             fn.apply(th, args);
15         }, delay);
16     };
17 }
18 // 节流
19 export function _throttle(fn, interval) {
20     var last;
21     var timer;
22     var interval = interval || 200;
23     return function () {
24         var th = this;
25         var args = arguments;
26         var now = +new Date();
27         if (last && now - last < interval) {
28             clearTimeout(timer);
29             timer = setTimeout(function () {
30                 last = now;
31                 fn.apply(th, args);
32             }, interval);
33         } else {
34             last = now;
35             fn.apply(th, args);
36         }
37     }
38 }

1  methods: {
2     changefield: _debounce(function(_type, index, item) {
3         // do something ...
4     }, 200)
5   }