JavaScript处理字符串的案例

这篇文章主要为大家详细介绍了JavaScript 操作字符串的简单示例，具有一定的参考价值，可以用来参考一下。

包罗万象

function manipulateString(passedString1, passedString2) {
var concatString;
// The string passed to concat is added to the end of the first string

concatString = passedString1.concat(passedString2);
alert(concatString);
// The following if statement will be true since first word is Tony
if (concatString.charAt(3) == "y") {
alert("Character found!");
}

// The last position of the letter n is 10
alert("The last index of n is: " + concatString.lastIndexOf("n"));
// A regular expression is used to locate and replace the substring
var newString = concatString.replace(/Tony/gi,"General");
// The following yields Please salute General Patton
alert("Please salute " + newString);

// The match function returns an array containing all matches found
matchArray = concatString.match(/Tony/gi);
for (var i=0; i<matchArray.length;i++) {
alert("Match found: " + matchArray[i]);
}

// Determine if the regular expression is found, a –1 indicates no
if (newString.search(/Tony/) == -1) {
alert("String not found");
} else {
alert("String found.");
}

// Extract a portion of the string and store it in a new variable
var sliceString = newString.slice(newString.indexOf("l")+2,newString.length);
alert(sliceString);

// The split function creates a new array containing each value separated by a space
stringArray = concatString.split(" ");
for (var i=0; i<stringArray.length;i++) {
alert(stringArray[i];
}
alert(newString.toUpperCase());
alert(newString.toLowerCase());
}

特殊字符

var output = null; 
output = "Special Characters"; 
output += "n"; 
output += "==============="; 
output += "n"; 
output += "\t - tab"; 
output += "n"; 
output += "\b - backspace/delete"; 
output += "n"; 
output += "\r - carriage return"; 
output += "n"; 
output += "\n - newline"; 
output += "n"; 
output += "\f - form feed"; 
output += "n"; 
alert(output);

添加到工具箱中

function validation() {
var doc = document.forms[0];
var msg = "";
if (doc.Name.value == "") {
msg += "- Name is missingn";
}

if (doc.Address.value == "") {
msg += "- Address is missingn";
}

if (doc.ZipCode.value == "") {
msg += "- Zip code is missingn";
}

var zip = new String(doc.ZipCode.value);
if (zip.search(/^[0-9][0-9][0-9][0-9][0-9]$/)==-1) {
msg += "- Enter valid Zip code";
}
if (msg == "") {
doc.submit;
} else {
msg = "Please correct the following validation errors and re-submit:nn" + msg;
alert(msg);
}
}