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构造函数中
function Animal(name, age) {
this.name = name;
this.age = age;
}
绑定 DOM 元素
<input type="button" onclick="showInfo(this);" value="button" />
获取 DOM 元素的属性或者值
<input id="btn" type="button" value="input" />;
let btn = document.getElementById("btn");
btn.onclick = function() {
console.log(this.value);
};
call apply 求取数组最大值
let arr = [3, 2, 5, 1, 6];
Math.max.apply(this, arr);
Math.max.call(this, 3, 2, 5, 1, 6);