vars='this is a string';s.len=10;//创建了一个临时的 String 对象,随即销毁alert(s.len);//第三行代码又会创建一个新的临时对象, 并没有返回 10,而是 undefined!a = 1;a.s=2;a.s// 一样 undefined 第二行代码只是创建了一个临时的 String 对象,随即销毁。 第三行代码又会创建一个新的临时对...
String:单引号和双引号不能交叉使用;使用.length属性访问字符串长度;字符串一旦被创建,其值不能改变,若想改变必须销毁原有字符串。String中常见的转义:\n换行;\t制表符;\b空格;\r回车符;\f分页符;\\斜杠\。 强制类型转换为string的函数有两种,分别是toString()和String()。 其中number,boolean,string,object以...
}// Compare primitives and functions.// Check if both arguments link to the same object.// Especially useful on the step where we compare prototypesif(x === y) {returntrue; }// Works in case when functions are created in constructor.// Comparing dates is a common scenario. Another buil...
Step 1: We have to find out if the given string is a palindrome or not. So to do this task we will create a function called isPalindrome and in this function, we will pass a parameter of string as str. So for this str, we will check the palindrome condition. Step 2: After the...
> typeof new String('abc') 'object' > new String('abc') === 'abc' false 作为函数,它们将值转换为相应的原始类型(见[转换为布尔值、数字、字符串和对象的函数](ch08.html#convert_to_primitive "转换为布尔值、数字、字符串和对象的函数"))。这是推荐的转换方法: ...
(y is less than x or y is less than z) // Check if z is greater than or equal to 20 and (z is less than y or z is less than x) return ( (x >= 20 && (x < y || x < z)) || (y >= 20 && (y < x || y < z)) || (z >= 20 && (z < y || z < x)...
Check if a string includes "world": lettext ="Hello world, welcome to the universe."; text.includes("world"); Try it Yourself » Check if a string includes "world". Start at position 12: lettext ="Hello world, welcome to the universe."; ...
CallCheckObjectCoercible(baseValue ).Let propertyNameString beToString(propertyNameValue ).If the ...
a >= b (check if a is greater than or equal to b) # Strings a + b (string concatenation) a * num (repeat string <num> times) # Special Operations [[Link]].value (fetch `value` from page `Link`) 使用如下: test:: 测试变量 ...
data-basemap "<String>" Current basemap. data-loaded "" (empty string) Added to the map container after the map is loaded. data-scale "<Number>" Current map scale. data-updating "" (empty string) Added to the map container when the map is updating. data-zoom "<Number>" Current map...