JSON.stringify && JSON.parse

var temp = [1,2,3,4,5];
console.log('type:',typeof temp); //输出：type: object
console.log('length:',temp.length);//输出：length: 5
console.log('temp[0]:',temp[0]);//输出：temp[0]: 1

temp = JSON.stringify(temp); 
console.log('type:',typeof temp);//输出：type: string
console.log('length:',temp.length);//输出：length: 11
console.log('temp[0]:',temp[0]);//输出：temp[0]: [

temp = JSON.parse(temp);
console.log('type:',typeof temp);//输出：type: object
console.log('length:',temp.length);//输出：length: 5
console.log('temp[0]:',temp[0]);//输出：temp[0]: 1