javascript字符串代码在前端的美化、格式化展示处理

第一步：在百度网盘上下载两个js文件；

第二步：在自己的jsp或html头部引入该两个js文件：

<script type="text/javascript" src="beautify.js"></script>
<script type="text/javascript" src="beautify-html.js"></script>

<xmp class="beautify">你需要美化的javascript脚本</xmp>

第三步：在自己的js中定义方法如下：

var the = { beautify_in_progress: false };
//this dummy function alleviates Chrome large string corruption by probably shoveling the corruption bug to some other area
if (/chrome/.test(navigator.userAgent.toLowerCase())) {
    String.prototype.old_charAt = String.prototype.charAt;
    String.prototype.charAt = function (n) { return this.old_charAt(n); }
}
function unpacker_filter(source) {
    var trailing_comments = '';
    var comment = '';
    var found = false;

    do {
        found = false;
        if (/^\s*\/\*/.test(source)) {
            found = true;
            comment = source.substr(0, source.indexOf('*/') + 2);
            source = source.substr(comment.length).replace(/^\s+/, '');
            trailing_comments += comment + "\n";
        } else if (/^\s*\/\//.test(source)) {
            found = true;
            comment = source.match(/^\s*\/\/.*/)[0];
            source = source.substr(comment.length).replace(/^\s+/, '');
            trailing_comments += comment + "\n";
        }
    } while (found);

    return trailing_comments + source;
}
function beautify(elem) {
    if (the.beautify_in_progress) return;

    the.beautify_in_progress = true;

    // var source = $('#source').val();
    var source = $(elem).html();

    var indent_size = $('#tabsize').val();
    var indent_char = indent_size == 1 ? '\t' : ' ';
    var preserve_newlines = $('#preserve-newlines').attr('checked');
    var keep_array_indentation = $('#keep-array-indentation').attr('checked');
    var brace_style = $('#brace-style').val();

    if ($('#detect-packers').attr('checked')) {
        source = unpacker_filter(source);
    }

    var comment_mark = '<-' + '-';
    var opts = {
                indent_size: indent_size,
                indent_char: indent_char,
                preserve_newlines:preserve_newlines,
                brace_style: brace_style,
                keep_array_indentation:keep_array_indentation,
                space_after_anon_function:true};

    if (source && source[0] === '<' && source.substring(0, 4) !== comment_mark) {
        $(elem).html(
            style_html(source, opts)
        );
    } else {
        var v = js_beautify(unpacker_filter(source), opts);
        $(elem).html(v);
    }

    the.beautify_in_progress = false;
}

$(function(){
	//js美化
	$('.beautify').each(function(){
		beautify(this);
	}); 
});