方法说明:
将字符串转成对象。说白了其实就是把url上带的参数串转成数组对象。(看例子就知道咯)
语法:
querystring.parse(str, [sep], [eq], [options])
接收参数:
str 欲转换的字符串
sep 设置分隔符,默认为 ‘&'
eq 设置赋值符,默认为 ‘='
[options] maxKeys 可接受字符串的最大长度,默认为1000
例子:
querystring.parse('foo=bar&baz=qux&baz=quux&corge') // returns { foo: 'bar', baz: ['qux', 'quux'], corge: '' }
源码:
// Parse a key=val string. QueryString.parse = QueryString.decode = function(qs, sep, eq, options) { sep = sep || '&'; eq = eq || '='; var obj = {}; if (!util.isString(qs) || qs.length === 0) { return obj; } var regexp = /+/g; qs = qs.split(sep); var maxKeys = 1000; if (options && util.isNumber(options.maxKeys)) { maxKeys = options.maxKeys; } var len = qs.length; // maxKeys <= 0 means that we should not limit keys count if (maxKeys > 0 && len > maxKeys) { len = maxKeys; } for (var i = 0; i < len; ++i) { var x = qs[i].replace(regexp, '%20'), idx = x.indexOf(eq), kstr, vstr, k, v; if (idx >= 0) { kstr = x.substr(0, idx); vstr = x.substr(idx + 1); } else { kstr = x; vstr = ''; } try { k = decodeURIComponent(kstr); v = decodeURIComponent(vstr); } catch (e) { k = QueryString.unescape(kstr, true); v = QueryString.unescape(vstr, true); } if (!hasOwnProperty(obj, k)) { obj[k] = v; } else if (util.isArray(obj[k])) { obj[k].push(v); } else { obj[k] = [obj[k], v]; } } return obj; };