JavaScript Array 对象 实例 检测数组site是否包含 runoob : letsite=['runoob','google','taobao'];site.includes('runoob');//truesite.includes('baidu');//false 尝试一下 » 定义和用法 includes() 方法用来判断一个数组是否包含一个指定的值,如果是返回 true,否则false。
fruits.includes("Mango"); Try it Yourself » Start the search at position 3: constfruits = ["Banana","Orange","Apple","Mango"]; fruits.includes("Banana",3); Try it Yourself » Description Theincludes()method returnstrueif an array contains a specified value. ...
[1, 2, 3].includes(3, 3);// false [1, 2, 3].includes(3, -1);// true [1, 2, NaN].includes(NaN);// true 返回值:返回一个布尔型,判断一个数组是否包含一个指定的值,如果是返回 true,否则false。 JS Array 对象中的includes()方法浏览器的兼容性 js array使用includes()检测数组是否包含...
The "includes()" method, as the syntax suggests, takestwoparameters (see the syntax above). However, I have provided only one in the above example, the value I want to search in the array, starting from the beginning or "0" position in the array. ← Previous...
includes('runoob'); // true site.includes('baidu'); // false 尝试一下 » 定义和用法includes() 方法用来判断一个数组是否包含一个指定的值,如果是返回 true,否则false。[1, 2, 3].includes(2); // true [1, 2, 3].includes(4); // false [1, 2, 3].includes(3, 3); // false [...
[1, 2, 3].includes(3, -1); // true [1, 2, NaN].includes(NaN); // true 1. 2. 3. 4. 5. 返回值:返回一个布尔型,判断一个数组是否包含一个指定的值,如果是返回 true,否则false。 JS Array 对象中的includes()方法浏览器的兼容性 ...
我们可以使用Array.includes(Array.includes)重写以上条件句。 functiontest(fruit) {// 把条件提取到数组中constredFruits = ['apple','strawberry','cherry','cranberries'];if(redFruits.includes(fruit)) {console.log('red'); } } AI代码助手复制代码 ...
Example 1: Using includes() method letlanguages = ["JavaScript","Java","C","C++"]; // checking whether the array contains 'C'letcheck1 = languages.includes("C"); console.log(check1);// true // checking whether the array contains 'Ruby'letcheck2 = languages.includes("Ruby"); ...
现在A.filter(x=> B.includes(x.id) 这行代码得跑到快十秒，但 把B变成set A.filter(x=> B....
JavaScript Array.sort() Method The sort() method is used to sort the array in ascending order for numbers and in alphabetical order for strings, this is the default way. You can sort it in whatever way you like. constnum = [5,7,2,4,8]; ...