// Return a string representation of the range toString: function() { return "(" + this.from + "..." + this.to + ")"; } }; // Here are example uses of this new Range class let r = new Range(1,3); // Create a Range object; note the use of new...
x = "hello world"; // Strings of text in quotation marks. x = 'JavaScript'; // Single quote marks also delimit strings. x = true; // A Boolean value. x = false; // The other Boolean value. x = null; // Null is a special value that means "no value." x = undefined; // ...
5. 内置String函数可以将任意值转换成字符串 事实上,我们可以使用 String 内置函数将任何类型的值转换为字符串。它是将原始类型转换为字符串的最佳选择。检查下一个示例: String(0)//'0' String(true)//'true' String(null)//'null' String(undefined...
replace 方法在字符串中搜索指定的子字符串，并返回替换给定子字符串的新字符串。当使用字符串作为第一...
// Strings of text in quotation marks.x ='JavaScript';// Single quote marks also delimit strings.x =true;// A Boolean value.x =false;// The other Boolean value.x =null;// Null is a special value that means "no value."x =undefined;// Undefined is another special value like null....
},// Return a string representation of the rangetoString:function() {return"("+this.from+"..."+this.to+")"; } };// Here are example uses of this new Range classletr =newRange(1,3);// Create a Range object; note the use of newr.includes(2)// => true: 2 is in the rang...
JavaScript String Methods MethodDescription charAt() Returns the character at the specified index. concat() Joins two or more strings. replace() Replace a string with another string. split() Converts the string to an array of strings. substr() Returns a part of a string by taking the starti...
1. charAt()按照索引获取字符2. toLowerCase()转小写3. toUpperCase()转大写4. replace()替换字符串...
replace()Searches a string for a pattern, and returns a string where the first match is replaced replaceAll()Searches a string for a pattern and returns a new string where all matches are replaced search()Searches a string for a value, or regular expression, and returns the index (position...
Pass "eager" to always replace function calls whenever possible, or a positive integer to specify an upper bound for each individual evaluation in number of characters. expression (default: false)— Pass true to preserve completion values from terminal statements without return, e.g. in ...