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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Less_than_or_equal below:

小于ç‰äºŽï¼ˆ<=） - JavaScript | MDN

小于等于（<=）

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小于等于运算符（<=）在左操作数小于等于右操作数时返回 true，否则返回 false。

尝试一下 
console.log(5 <= 3);
// Expected output: false

console.log(3 <= 3);
// Expected output: true

// Compare bigint to number
console.log(3n <= 5);
// Expected output: true

console.log("aa" <= "ab");
// Expected output: true
语法 描述

操作数比较使用与小于运算符相同的算法，除了相等的值（在尝试转换后）会返回 true。

示例 字符串与字符串比较 
console.log("a" <= "b"); // true
console.log("a" <= "a"); // true
console.log("a" <= "3"); // false
字符串与数值比较 
console.log("5" <= 3); // false
console.log("3" <= 3); // true
console.log("3" <= 5); // true

console.log("hello" <= 5); // false
console.log(5 <= "hello"); // false
数值与数值比较 
console.log(5 <= 3); // false
console.log(3 <= 3); // true
console.log(3 <= 5); // true
数值与大整型比较 
console.log(5n <= 3); // false
console.log(3 <= 3n); // true
console.log(3 <= 5n); // true
比较 Boolean、null、undefined 和 NaN 
console.log(true <= false); // false
console.log(true <= true); // true
console.log(false <= true); // true

console.log(true <= 0); // false
console.log(true <= 1); // true

console.log(null <= 0); // true
console.log(1 <= null); // false

console.log(undefined <= 3); // false
console.log(3 <= undefined); // false

console.log(3 <= NaN); // false
console.log(NaN <= 3); // false
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