js中的裝飾器。攔截器。細細品味 bind apply call
阿新 • • 發佈：2019-01-09
var zlw = {
name: "zlw",
sayHello: function (age) {
console.log("hello, i am ", this.name + " " + age +" years old");
}
};
var xlj = {
name: "xlj",
};
zlw.sayHello(24);
VM273:4 hello, i am zlw 24 years old
undefined
zlw.sayHello.bind(xlj, 24)()
name: "zlw",
sayHello: function (age) {
console.log("hello, i am ", this.name + " " + age +" years old");
}
};
var xlj = {
name: "xlj",
};
zlw.sayHello(24);
VM273:4 hello, i am zlw 24 years old
undefined
zlw.sayHello.bind(xlj, 24)()
VM273:4 hello, i am xlj 24 years old
zlw.sayHello.call(xlj, 24);//hello, i am xlj 24 years old zlw.sayHello.apply(xlj, [24])
function debounce(fn, delay){// 維護一個 timer
let timer =null;// 能訪問 timer 的閉包returnfunction(){// 通過 ‘this’ 和 ‘arguments’ 獲取函式的作用域和變數
let context =this;
let args = arguments;// 如果事件被呼叫，清除 timer 然後重新設定 timer
clearTimeout(timer);
timer
}