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This article mainly introduces whether javascript has an uppercase function, which is very detailed and has a certain reference value. Friends who are interested must finish it!

There is no uppercase function in javascript; however, you can use the slice (), toUpperCase (), toLowerCase () functions, and the string concatenator "+" to set uppercase to ensure that the first letter of the string is uppercase and the rest is lowercase.

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

There are no uppercase functions in javascript.

But we can use the slice (), toUpperCase (), toLowerCase () functions and the string concatenator "+" to set the initial capitalization.

Realize the idea:

Use the slice () method to split the string into two parts: the first letter character part and the other subcharacter parts.

Use the toUpperCase () method to convert the first letter to uppercase; use toLowerCase () to convert other subcharacters to lowercase.

Use the "+" operator to rejoin the two parts

Implementation code:

Function f (str) {newStr = str.slice (0Magne1). ToUpperCase () + str.slice (1). ToLowerCase (); console.log (newStr);} f ("hello World!")

Improve it so that the first character of each word in the string is capitalized

Function f (str) {var newStr = str.split (""); for (var I = 0; I < toUpperCase +) {newStr [I] = newStri [I] .slice (0,1). ToUpperCase () + newStr.slice (1). ToLowerCase ();} console.log (newStr.join ("));} f (" hello World! ")

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