//节流
export const trottle = (func, time = 1000, context) => {
	let previous = new Date(0).getTime()
	return function(...args) {
		let now = new Date().getTime()
		if (now - previous > time) {
			func.apply(context, args)
			previous = now
		}
	}
}


//获取url后的参数  以对象返回
export function strToParams(str) {
	var newparams = {}
	for (let item of str.split('&')) {
		newparams[item.split('=')[0]] = item.split('=')[1]
	}
	return newparams
}

//对象参数转为以？&拼接的字符
export function paramsToStr(params) {
	let p = '';
	if (typeof params == 'object') {
		p = '?'
		for (let props in params) {
			p += `${props}=${params[props]}&`
		}
		p = p.slice(0, -1)
	}
	return p
}

/**
 * @description 复制到剪切板
 * @param value { String } 复制内容
 * @return { Promise } resolve | reject
 */
 export const copyClipboard = (value) => {
    const elInput = document.createElement('input')

    elInput.setAttribute('value', value)
    document.body.appendChild(elInput)
    elInput.select()

    try{
        if(document.execCommand('copy'))
            return Promise.resolve()
        else
            throw new Error()
    } catch(err) {
        return Promise.reject(err)
    } finally {
        document.body.removeChild(elInput)
    }
}