javascript - javascript 中的 String.Format 与 vb.net 中一样

Question

这个问题已经有答案了:

JavaScript equivalent to printf/String.Format (61 个回答)

已关闭 9 年前。

javascript 中是否有像 vb.net 中那样的 String.Format 代码？

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

Answer 1

很简单。不用担心。只需将格式更改为格式即可。并将以下脚本文件添加到您的项目中

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

字符串.js

 // JScript File

//String.js - Sky Sanders 于 2010 年 3 月 28 日从 MicrosoftAjax.js 中解放出来

/* 版权所有 (c) 2009，CodePlex 基金会 保留所有权利。

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);