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JavaScript常用函数汇总

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获取URL参数

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/**
 * 获取URL参数
 * @param  {[string]} name [description]
 * @param  {[string]} url  [description]
 * @return {[string]}      [description]
 */
function getQuery(name, url) {
    //参数：变量名，url为空则表从当前页面的url中取
    var u = arguments[1] || window.location.search,
            reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)"),
            r = u.substr(u.indexOf("\?") + 1).match(reg);
    return r != null ? r[2] : "";
}

事件绑定

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/**
 * 事件绑定
 */
 var EventUtil = {
        addHandler: function( element, type, handler ) {
            if ( element.addEventListener ) {
                element.addEventListener ( type, handler, false );
            } else if ( element.attachEvent ) {
                element.attachEvent ( "on" + type, handler );
            } else {
                element["on" + type] = handler;
            }
        },

        getEvent: function ( event ) {
            return event ? event : window.event;
        },

        getTarget: function ( event ) {
            return event.target || event.srcElement;
        },

        preventDefault: function ( event ) {
            if ( event.preventDefault ) {
                event.preventDefault();
            } else {
                event.returnValue = false;
            }
        },

        removeHandler: function( element, type, handler ) {
            if ( element.removeEventListener ) {
                element.removeEventListener ( type, handler, false );
            } else if ( element.detachEvent ) {
                element.detachEvent ( "on" + type, handler );
            } else {
                element["on" + type] = null;
            }
        },

        stopPropagation: function ( event ) {
            if ( event.stopPropagation ) {
                event.stopPropagation();
            } else {
                event.cancelBubble = true;
            }
        }

    };

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/**
 * 对象转为URL参数
 * @param  {[type]} param [description]
 * @param  {[type]} key   [description]
 * @return {[type]}       [description]
 */
var parseParam = function(param, key) {
    var paramStr = "";
    if (param instanceof String || param instanceof Number || param instanceof Boolean) {
        paramStr += "&" + key + "=" + encodeURIComponent(param);
    } else {
        $.each(param, function(i) {
            var k = key == null ? i : key + (param instanceof Array ? "[" + i + "]" : "." + i);
            paramStr += '&' + parseParam(this, k);
        });
    }
    return paramStr.substr(1);
};

//调用：
var obj = {
    name: 'tom',
    'class': {
        className: 'class1'
    },
    classMates: [{
        name: 'lily'
    }]
};
parseParam(obj);
结果： "name=tom&class.className=class1&classMates[0].name=lily"
parseParam(obj, 'stu');
结果： "stu.name=tom&stu.class.className=class1&stu.classMates[0].name=lily"
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//替换url中指定参数
var replaceParam = function(param, value, url, forceReplace) {
    url = url || location.href;
    var reg = new RegExp("([\\?&]" + param + "=)[^&#]*"), hash = location.hash;
    if (!url.match(reg)) {
        if (!!hash) {
            url = url.substring(0, url.indexOf('#'));
        }
        return ((url.indexOf("?") == -1) ? (url + "?" + param + "=" + value) : (url + "&" + param +
            "=" + value)) + hash;
    }
    if (forceReplace) {
        return url.replace(reg, "$1" + value);
    }
    return url;
};
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//文字截断
function truncation() {
    if (window.CSS && window.CSS.supports && window.CSS.supports('display', '-webkit-box')) {
        return;
    }

    $('div span').each(function(index, el) {
        var line = 0,
            step, suffix = "...",
            clientRects, isLimit = false,
            string = this.innerHTML,
            limit = 2;  //限制行数

        clientRects = this.getClientRects();
        line = clientRects.length;

        if (line <= limit) {
            return;
        }

        while (line > limit) {
            isLimit = true;
            step = line > (limit + 1) ? 7 : 1;
            string = string.substr(0, string.length - step);
            this.innerHTML = string + suffix;
            clientRects = this.getClientRects();
            line = clientRects.length;
        }
        if (isLimit) {
            string += suffix;
        }
        $(this).html(string);
    });
}

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