复制代码 代码如下:

// Initializes a new instance of the StringBuilder class

// and appends the given value if supplied

function StringBuilder(value)

{

this.strings = new Array("");

this.append(value);

}

// Appends the given value to the end of this instance.

StringBuilder.prototype.append = function (value)

{

if (value)

{

this.strings.push(value);

}

}

// Clears the string buffer

StringBuilder.prototype.clear = function ()

{

this.strings.length = 1;

}

// Converts this instance to a String.

StringBuilder.prototype.toString = function ()

{

return this.strings.join("");

}

代码看上去很简单直接。实际上就是用array,push,join等来实现，以下是如何使用该类

复制代码 代码如下:

// create a StringBuilder

var sb = new StringBuilder();

// append some text

sb.append("Some of those preparing for international ");

sb.append("exams such as the TOEFL ");

sb.append("need extra practice for the listening section");

// get the full string value

var s = sb.toString();

alert(s);

非常简单，不需要太多的说明。如果你在.NET中用了StringBuilder，你也会知道这里如何用。