28个常用JavaScript方法集锦(2)

function getEvent() {
    if (document.all) {
        return window.event; //如果是ie
    }
    func = getEvent.caller;
    while (func != null) {
        var arg0 = func.arguments[0];
        if (arg0) {
            if ((arg0.constructor == Event || arg0.constructor == MouseEvent)
|| (typeof (arg0) == "object" && arg0.preventDefault && arg0.stopPropagation)) {
                return arg0;
            }
        }
        func = func.caller;
    }
    return null;
};

/* 字符串截取方法  */

复制代码 代码如下:

getCharactersLen: function (charStr, cutCount) {
        if (charStr == null || charStr == '') return '';
        var totalCount = 0;
        var newStr = '';
        for (var i = 0; i < charStr.length; i++) {
            var c = charStr.charCodeAt(i);
            if (c < 255 && c > 0) {
                totalCount++;
            } else {
                totalCount += 2;
            }
            if (totalCount >= cutCount) {
                newStr += charStr.charAt(i);
                break;
            }
            else {
                newStr += charStr.charAt(i);
            }
        }
        return newStr;
    }

/*  JS 弹出新窗口全屏  */

复制代码 代码如下: