JS把预定义的字符转换为HTML实体的函数htmlspecialchars


JavaScript #htmlspecialchars #函数2012-06-07 16:34

函数代码:

function htmlspecialchars (string, quote_style, charset, double_encode) {
    var optTemp = 0,
        i = 0,
        noquotes = false;
    if (typeof quote_style === 'undefined' || quote_style === null) {
        quote_style = 2;
    }
    string = string.toString();
    if (double_encode !== false) { // Put this first to avoid double-encoding
        string = string.replace(/&/g, '&');
    }
    string = string.replace(/</g, '<').replace(/>/g, '>');
 
    var OPTS = {
        'ENT_NOQUOTES': 0,
        'ENT_HTML_QUOTE_SINGLE': 1,
        'ENT_HTML_QUOTE_DOUBLE': 2,
        'ENT_COMPAT': 2,
        'ENT_QUOTES': 3,
        'ENT_IGNORE': 4
    };
    if (quote_style === 0) {
        noquotes = true;
    }
    if (typeof quote_style !== 'number') { // Allow for a single string or an array of string flags
        quote_style = [].concat(quote_style);
        for (i = 0; i < quote_style.length; i++) {
            // Resolve string input to bitwise e.g. 'ENT_IGNORE' becomes 4
            if (OPTS[quote_style[i]] === 0) {
                noquotes = true;
            }
            else if (OPTS[quote_style[i]]) {
                optTemp = optTemp | OPTS[quote_style[i]];
            }
        }
        quote_style = optTemp;
    }
    if (quote_style & OPTS.ENT_HTML_QUOTE_SINGLE) {
        string = string.replace(/'/g, ''');
    }
    if (!noquotes) {
        string = string.replace(/"/g, '"');
    }
 
    return string;
}


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