How javascript concatenates characters to form a string
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Javascript concatenate characters to form a string method: 1, use the "+" plus operator, syntax "character 1 + character 2"; 2, use concat () method, syntax "character object 1.concat (character 2, character 3, character 4..., character n)"; 3, use join () method.
The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.
In javascript, there are three ways to concatenate (concatenate) characters to form strings. Let's introduce them one by one.
Method 1: use the "+" plus operator
The easiest way to connect a string is to use the plus operator.
Var S1 = "a", S2 = "b", S3 = "c", S4 = "d", S5 = "e", S6 = "f", S7 = "g"; console.log (S1 + S2 + S3 + S4 + S6 + S7); / / returns the string "abcdefg"
Output result:
Method 2: use the concat () method
Use the string concat () method to add multiple parameters to the end of a specified string. There is no limit to the type and number of parameters in this method. It converts all parameters to strings, then concatenates them sequentially to the end of the current string and finally returns the concatenated string.
Var S1 = "a", S2 = "b", S3 = "c"; var S4 = s1.concat (S2, S3, "d", "e", "f"); / / call concat () connection string console.log (S4); / / returns the string "abcdef"
Output result:
The concat () method does not modify the value of the original string, similar to the operation of the concat () method of an array.
Method 3: use the join () method
In a specific operating environment, you can also use the join () method of an array to concatenate strings, such as HTML string output.
Var s = "a", a = []; for (var I = 0; I
< 10; i ++) { a.push(s);}var str = a.join("");a = null;console.log(str); 输出结果：
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