template

<van-field

    v-model="value"

  />

watch

watch: {

    value() {

        this.fnThrottle(this.searchAction, 300)(); // 无操作，延迟300ms后执行方法

    }

}

methods

searchAction() { // 执行的函数

        console.log(this.value)

 },

fnThrottle (method, delay) {

    var timer = this.timer;

    return _=>{

        var context = this;

        var args = arguments;

        clearTimeout(timer);

        this.timer=setTimeout(_=>{

            method.apply(context,args);

        },delay);

    }

},