xiaojue

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xiaojue

function combine(a) {
    var fn = function(n, src, got, all) {
        if (n == 0) {
            if (got.length > 0) {
                all[all.length] = got;
            }
            return;
        }
        for (var j = 0; j < src.length; j++) {
            fn(n - 1, src.slice(j + 1), got.concat([src[j]]), all);

xiaojue

function getRandom(n, arr, ret) {
    ret = ret || [];
    var randomNum = parseInt(Math.random() * (arr.length - 1), 10);
    if (ret.indexOf(randomNum) === -1) {
        ret.push(randomNum);
    } else {
        getRandom(n, arr, ret);
    }
    return ret.length === n ? ret : getRandom(n, arr, ret);
}

xiaojue

function clipboard2Img(options){
			var self = this;
			this.URL = options.host + options.api;
			this.success = options.success || function(){};
			if(!options.ele){
				return alert('options ele must have');
			}
			options.ele.addEventListener('paste', self.getClipboardImage.bind(this), false)
		}