// 问题1:实现字符串个数的输出 //对字符串进行切割(返回一个数组,用逗号隔开) var spritsentence='Rome was not built in a day'; writeDocument("原句子为:"+spritsentence); //对字符串进行切割(分隔符:空格) writeDocument("拆分后每个元素为:"+spritsentence.split('')); var count1=0; for(var i=0;i<spritsentence.length;i++){ count1++; } // 输出个数 writeDocument("字符串的个数为:"+count1); //用于换行 function writeDocument(variable) { document.write(variable + "<br/>"); }