vue项目 如何判断用户按下了 ctrl + d 来收藏网页

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...    data () {     return {       keyObj: {         Control: -1,         d: -1,       },     }   }, ...   mouted() {     document.onkeydown = (e) => {       // ctrl   keyCode ==> 17  |  D  d keyCode ==> 68         // 用户按下 ctrl 17       const { keyCode } = e       // console.log('keyCode ===>', keyCode);       if (keyCode === 17) {         this.keyObj.Control = 17       } else if (keyCode === 68 && this.keyObj.Control === 17) {         this.keyObj.d = 68       }     }     document.onkeyup = (e) => {       const { keyCode } = e       if (keyCode === 17) {         this.keyObj = {           Control: -1,           d: -1,         }       }     } } ...   watch: {     keyObj: {       handler: function (obj) {         this.ctrl$dHandler(obj)       },       deep: true     }   }, ...   methods: {     ctrl$dHandler (obj) {       const { Control, d, } = obj       if (Control === 17 && d === 68) {         // alert('用户按下了 ctrl + d, #######')       }     },   }