# 全局变量控制
 cancelDealHandler(){
     if(something){ //取消
         cancle = true;
     }else {
         cancle = false;
     }
 }

line.on('mouseover',() => {
    //触发tooltip显示
    showTip();
}).on('mouseout',() => { 
   _.delay(() => {
       if(cancle){ //取消隐藏,全局变量控制
         return;
       }
       hideTip();
   },3000);
})
;

/**
 * Invokes `func` after `wait` milliseconds. Any additional arguments are
 * provided to `func` when it's invoked.
 *
 * @since 0.1.0
 * @category Function
 * @param {Function} func The function to delay.
 * @param {number} wait The number of milliseconds to delay invocation.
 * @param {...*} [args] The arguments to invoke `func` with.
 * @returns {number} Returns the timer id.
 * @example
 *
 * delay(text => console.log(text), 1000, 'later')
 * // => Logs 'later' after one second.
 */
function delay(func, wait, ...args) {
  if (typeof func !== 'function') {
    throw new TypeError('Expected a function')
  }
  return setTimeout(func, +wait || 0, ...args)
}

export default delay

# 全局变量控制
 cancelDealHandler(){
     if(something){ //取消
         clearTimeout(delayTimer);
     }else {
         hideTip();
     }
 }

line.on('mouseover',() => {
     //触发tooltip显示
     clearTimeout(delayTimer);
     showTip();
 }).on('mouseout',() => { 
    clearTimeout(delayTimer);
    delayTimer = _.delay(() => {
        hideTip();
    },3000);
 })
 ;