Question

javascript中是否有类似String.Format的代码，就像在vb.net中一样？

 val=String.Format("{0:n" & ratedis & "}", to_arr(0))

Answer 1

安静简单。别担心。只需将格式更改为格式。并将以下脚本文件添加到项目中

 val= String.format("{0:n" + ratedis + "}", to_arr[0]);

String.js

 // JScript File

// String.js - 由Sky Sanders于03/28/10从MicrosoftAjax.js解放

Redistribution and use in source and binary forms, with or without modification, are permitted 
provided that the following conditions are met:

*   Redistributions of source code must retain the above copyright notice, this list of conditions 
    and the following disclaimer.

*   Redistributions in binary form must reproduce the above copyright notice, this list of conditions 
    and the following disclaimer in the documentation and/or other materials provided with the distribution.

*   Neither the name of CodePlex Foundation nor the names of its contributors may be used to endorse or 
    promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY EXPRESS OR IMPLIED 
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE 
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN 
IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</textarea>

* /

(function(window) {

$type = String;
$type.__typeName = 'String';
$type.__class = true;

$prototype = $type.prototype;
$prototype.endsWith = function String$endsWith(suffix) {
    /// <summary>Determines whether the end of this instance matches the specified string.</summary>
    /// <param name="suffix" type="String">A string to compare to.</param>
    /// <returns type="Boolean">true if suffix matches the end of this instance; otherwise, false.</returns>
    return (this.substr(this.length - suffix.length) === suffix);
}

$prototype.startsWith = function String$startsWith(prefix) {
    /// <summary >Determines whether the beginning of this instance matches the specified string.</summary>
    /// <param name="prefix" type="String">The String to compare.</param>
    /// <returns type="Boolean">true if prefix matches the beginning of this string; otherwise, false.</returns>
    return (this.substr(0, prefix.length) === prefix);
}

$prototype.trim = function String$trim() {
    /// <summary >Removes all leading and trailing white-space characters from the current String object.</summary>
    /// <returns type="String">The string that remains after all white-space characters are removed from the start and end of the current String object.</returns>
    return this.replace(/^\s+|\s+$/g, '');
}

$prototype.trimEnd = function String$trimEnd() {
    /// <summary >Removes all trailing white spaces from the current String object.</summary>
    /// <returns type="String">The string that remains after all white-space characters are removed from the end of the current String object.</returns>
    return this.replace(/\s+$/, '');
}

$prototype.trimStart = function String$trimStart() {
    /// <summary >Removes all leading white spaces from the current String object.</summary>
    /// <returns type="String">The string that remains after all white-space characters are removed from the start of the current String object.</returns>
    return this.replace(/^\s+/, '');
}

$type.format = function String$format(format, args) {
    /// <summary>Replaces the format items in a specified String with the text equivalents of the values of   corresponding object instances. The invariant culture will be used to format dates and numbers.</summary>
    /// <param name="format" type="String">A format string.</param>
    /// <param name="args" parameterArray="true" mayBeNull="true">The objects to format.</param>
    /// <returns type="String">A copy of format in which the format items have been replaced by the   string equivalent of the corresponding instances of object arguments.</returns>
    return String._toFormattedString(false, arguments);
}

$type._toFormattedString = function String$_toFormattedString(useLocale, args) {
    var result = '';
    var format = args[0];

    for (var i = 0; ; ) {
        // Find the next opening or closing brace
        var open = format.indexOf('{', i);
        var close = format.indexOf('}', i);
        if ((open < 0) && (close < 0)) {
            // Not found: copy the end of the string and break
            result += format.slice(i);
            break;
        }
        if ((close > 0) && ((close < open) || (open < 0))) {

            if (format.charAt(close + 1) !== '}') {
                throw new Error('format stringFormatBraceMismatch');
            }

            result += format.slice(i, close + 1);
            i = close + 2;
            continue;
        }

        // Copy the string before the brace
        result += format.slice(i, open);
        i = open + 1;

        // Check for double braces (which display as one and are not arguments)
        if (format.charAt(i) === '{') {
            result += '{';
            i++;
            continue;
        }

        if (close < 0) throw new Error('format stringFormatBraceMismatch');


        // Find the closing brace

        // Get the string between the braces, and split it around the ':' (if any)
        var brace = format.substring(i, close);
        var colonIndex = brace.indexOf(':');
        var argNumber = parseInt((colonIndex < 0) ? brace : brace.substring(0, colonIndex), 10) + 1;

        if (isNaN(argNumber)) throw new Error('format stringFormatInvalid');

        var argFormat = (colonIndex < 0) ? '' : brace.substring(colonIndex + 1);

        var arg = args[argNumber];
        if (typeof (arg) === "undefined" || arg === null) {
            arg = '';
        }

        // If it has a toFormattedString method, call it.  Otherwise, call toString()
        if (arg.toFormattedString) {
            result += arg.toFormattedString(argFormat);
        }
        else if (useLocale && arg.localeFormat) {
            result += arg.localeFormat(argFormat);
        }
        else if (arg.format) {
            result += arg.format(argFormat);
        }
        else
            result += arg.toString();

        i = close + 1;
    }

    return result;
}

})(window);

在javascript中的String.Format，如在vb.net中

1 个答案: