The less than or equal operator (
<=
) returns
true
if the left operand is less than or equal to the right operand, and
false
否则。
x <= y
The operands are compared using the Abstract Relational Comparison algorithm. See the documentation for the Less than operator for a summary of this algorithm.
console.log("a" <= "b"); // true
console.log("a" <= "a"); // true
console.log("a" <= "3"); // false
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
console.log(5 <= 3); // false console.log(3 <= 3); // true console.log(3 <= 5); // true
console.log(5n <= 3); // false console.log(3 <= 3n); // true console.log(3 <= 5n); // true
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
| 规范 |
|---|
|
ECMAScript (ECMA-262)
The definition of 'Relational operators' in that specification. |
| Desktop | Mobile | Server | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Less than or equal (
a <= b
)
|
Chrome 1 | Edge 12 | Firefox 1 | IE 3 | Opera 3 | Safari 1 | WebView Android 1 | Chrome Android 18 | Firefox Android 4 | Opera Android 10.1 | Safari iOS 1 | Samsung Internet Android 1.0 | nodejs 0.1.100 |
完整支持