A function for word-wrap and return a string array.
var wrap = require('canvas-word-wrap')
var canvas = document.createElement('canvas')
var ctx = canvas.getContext('2d')
var text = 'abc 123 一二三四五六七 abc 123 一二三四五六七 abc 123 一二三四五六七'
var textArray = wrap(ctx, text, 20, 100, {lineClamp: 2} ===> ['abc 123 一', '二三四五...']